Is it possible to hold your b. for a very lengthy time

1 min 6 secs

1 min 34 secs

12 mins 17 secs

5 mins 1 sec

3 mins 22 secs

5 mins 14 secs

5 mins 6 secs

7 mins

10 mins 10 secs

5 mins

16 mins 40 secs

1 hour 27 mins 14 secs

12 mins

13 mins 14 secs

5 mins 27 secs

5 mins 8 secs

12 mins 1 sec

5 mins 10 secs

5 mins 10 secs

5 mins 13 secs

5 mins 8 secs

5 mins 10 secs

23 mins 1 sec

5 mins 12 secs

5 mins 13 secs

5 mins 7 secs

5 mins 9 secs

5 mins 13 secs

5 mins 6 secs

26 mins 44 secs

5 mins 11 secs

5 mins 11 secs

5 mins 14 secs

5 mins

5 mins 9 secs

28 mins 14 secs

12 mins 37 secs

6 mins 31 secs

12 mins 27 secs

8 mins