Met my old math teacher again after 20 years - his lessons weren't that rough in the old days

4 mins 24 secs

24 mins 42 secs

2 mins 25 secs

8 mins

1 hour 29 mins 4 secs

5 mins 10 secs

5 mins 43 secs

13 mins 31 secs

7 mins 49 secs

32 mins 18 secs

20 mins 28 secs

6 mins 25 secs

17 mins 58 secs

15 mins 27 secs

12 mins 48 secs

2 mins 33 secs

32 mins 38 secs

31 mins 36 secs

2 mins 57 secs

52 secs

5 mins 23 secs

8 mins

13 mins 8 secs

25 mins 58 secs

12 mins 28 secs

14 mins 16 secs

41 mins 23 secs

7 mins 50 secs

23 mins 41 secs

11 mins 28 secs

12 mins 42 secs

12 mins 38 secs

13 mins 56 secs

7 mins 56 secs

5 mins 45 secs

10 mins 47 secs

5 mins 39 secs

10 mins 12 secs

23 mins 38 secs

31 mins 58 secs