Or it could be a butter effect... 
(Spreading it thin...)
1 person : indefinitely

2 people : 1 hour 30 minutes

3 peps: 1 hour 10 mins

4 peps 1 hour

5 peps 45 mins

6 peps 35 mins

7 peps 20 mins

8 peps 10 mins

9 peps 5 mins 

10 peps 3 mins

16 peps 3 secs

Etc