Channel · @freesciencelessons

Freesciencelessons

@freesciencelessons · 993K subscribers · 776 videos

A course from this channel is on Best free GCSE and A-level revision courses on YouTube, ranked by total hours

Total watch time

2d 7h 26m

at 1× speed · exactly 2 days, 7 hours, 26 minutes, 17 seconds at 1×

custom

At each speed

1×	2d 7h 26m 17s
1.25×	1d 20h 21m 2s	−11h 5m
1.5×	1d 12h 57m 31s	−18h 29m
1.75×	1d 7h 40m 44s	−23h 46m
2×	1d 3h 43m 9s	−1d 3h 43m

Average video4m 17s

Longest9m 59s

Shortest27s

Uploading since2016

Next time, skip the copying: change youtube.com to playlistduration.com in any playlist, video or channel address and it opens here.

Uploads by year

11 years

Year	Videos	Watch time	Average
2026	28	1h 39m	3m 32s
2025	30	3h 8m	6m 15s
2024	73	5h 56m	4m 53s
2023	113	8h 27m	4m 29s
2022	73	5h 23m	4m 26s
2021	72	5h 30m	4m 35s
2020	68	4h 48m	4m 14s
2019	2	6m 29s	3m 15s
2018	143	9h 7m	3m 49s
2017	162	10h 27m	3m 52s
2016	12	54m 47s	4m 34s

Playlists (61)

Every public playlist on the channel — open one for its full breakdown

Lengths are calculated on demand so this page stays fast.

#	Playlist	Videos	Length
1	A Level Biology (Year 13) Genetics and Evolution	24	length →
2	A Level Biology (Year 13) "Homeostasis and Excretion"	26	length →
3	A Level Chemistry (Year 13) "Reactions of Aldehydes and Ketones"	7	length →
4	A Level Biology (Year 13) The Nervous System and Muscle Contraction	19	length →
5	A Level Biology (Year 13) Photosynthesis	5	length →
6	A Level Chemistry (Year 13) "Benzene and Benzene Compounds"	8	length →
7	A Level Biology (Year 13) "Respiration"	9	length →
8	A Level Biology "Biodiversity"	9	length →
9	A Level Biology "Classification and Evolution"	9	length →
10	A Level Biology "Infectious Diseases and the Immune System"	14	length →
11	A Level Chemistry "Qualitative Analysis"	4	length →
12	A Level Chemistry "Kinetics and Equilibria"	10	length →
13	A Level Chemistry "The Periodic Table"	17	length →
14	A Level Biology "Exchange and Transport in Plants"	11	length →
15	A Level Biology "Exchange and Transport in Animals"	22	length →
16	AQA GCSE Science Working Scientifically	6	length →
17	A Level Biology "Cell Structure"	17	length →
18	A Level Biology "Cell Division"	5	length →
19	A Level Chemistry "Organic Chemistry"	37	length →
20	A Level Biology "Cell Membranes and Movement of Substances"	9	length →
21	A Level Biology "Enzymes"	10	length →
22	A Level Chemistry "Enthalpy"	12	length →
23	A Level Chemistry Redox Reactions	6	length →
24	A Level Chemistry "Chemical Bonding"	14	length →
25	A Level Biology "DNA, RNA and Protein Synthesis"	8	length →
26	A Level Biology Biological Molecules	22	length →
27	A Level Chemistry Calculations Involving the Mole	26	length →
28	A Level Chemistry Atomic Structure	11	length →
29	AQA GCSE Biology Paper 2 Variation and Evolution	12	length →
30	AQA GCSE Physics Paper 2 Required Practicals	6	length →
31	AQA GCSE Physics Paper 1 Required Practicals	5	length →
32	AQA GCSE Chemistry Paper 2 Required Practicals	4	length →
33	AQA GCSE Chemistry Paper 1 Required Practicals	4	length →
34	AQA GCSE Biology Paper 2 Required Practicals	4	length →
35	AQA GCSE Biology Paper 1 Required Practicals	11	length →
36	AQA GCSE Biology Paper 2 Ecology	23	length →
37	AQA GCSE Biology Paper 2 Homeostasis	18	length →
38	AQA GCSE Biology Paper 2 Inheritance	12	length →
39	AQA GCSE Physics Paper 2 Space Physics	4	length →
40	AQA GCSE Physics Paper 2 Magnetism	12	length →
41	AQA GCSE Physics Paper 2 Forces	29	length →
42	AQA GCSE Physics Paper 2 Waves	20	length →
43	AQA GCSE Chemistry Paper 2 Resources	13	length →
44	AQA GCSE Chemistry Paper 2 The Atmosphere	6	length →
45	AQA GCSE Chemistry Paper 2 Chemical Analysis	8	length →
46	AQA GCSE Chemistry Paper 2 Organic Chemistry	15	length →
47	AQA GCSE Chemistry Paper 2 Rates of Reaction	11	length →
48	AQA GCSE Biology Paper 1 Bioenergetics	7	length →
49	AQA GCSE Biology Paper 1 Infectious Diseases	15	length →
50	AQA GCSE Biology Paper 1 Organisation	17	length →
51	AQA GCSE Biology Paper 1 Cell Biology	18	length →
52	AQA GCSE Physics Paper 1 Particle model of matter	9	length →
53	AQA GCSE Physics Paper 1 Atomic Structure and Radioactivity	11	length →
54	AQA GCSE Physics Paper 1 Electricity	24	length →
55	AQA GCSE Physics Paper 1 Energy	16	length →
56	AQA GCSE Chemistry Paper 1 Chemical Reactions	18	length →
57	AQA GCSE Chemistry Paper 1 Energy Changes	6	length →
58	AQA GCSE Chemistry Paper 1 Quantitative Chemistry	23	length →
59	AQA GCSE Chemistry Paper 1 Structure and Bonding	15	length →
60	AQA GCSE Chemistry Paper 1 Atomic Structure and the Periodic Table	23	length →
61	Revision and exam tips	3	length →

Longest uploads

Top 5 · 9m 59s and down

A Level Biology Revision (Year 13) "The Hardy Weinberg Principle" · 9:59 · 2025-04-01
A Level Biology (Year 13) "Autosomal Linkage" · 9:03 · 2025-03-17
A Level Biology Revision (Year 13) "Homeobox Genes and Body Plans" · 8:39 · 2025-01-26
A Level Biology Revision (Year 13) "Genetic Bottlenecks and the Founder Effect" · 8:32 · 2025-04-28
A Level Biology Revision (Year 13) "Thermoregulation in Endotherms" · 8:24 · 2024-08-14

For your README

Embed a badge

Show the watch time in a README or channel description — it links back here and updates itself

Markdown

[![Watch time: 2d 7h 26m · 776 videos](https://playlistduration.com/badge/channel/@freesciencelessons.svg)](https://playlistduration.com/channel/@freesciencelessons)

HTML

<a href="https://playlistduration.com/channel/@freesciencelessons"><img src="https://playlistduration.com/badge/channel/@freesciencelessons.svg" alt="Watch time: 2d 7h 26m · 776 videos" width="228" height="20"></a>

Add ?speed=1.5 to the image URL for the time at that speed, ?label=Course to change the left text, or ?style=flat-square for square corners.

Want the numbers themselves? GET https://playlistduration.com/api/v1/channel/@freesciencelessons returns them as JSON — free, no key. API docs →

Data from the YouTube Data API as of 2026-10-23 (cached). Uploads are counted newest first; private, deleted and live videos are excluded from totals.