It is 100min
1 hour=60min therefore 100min=1hour 40min
Well, 50-100min. With 5-10 or 30min in between.
8 h 30 min =7h 100 m 7h 100min-4h 55 min=3h 45 min
o2 is 15 euro for 100min and unlimited texting--2 years contract vodafone is 15 euro for 100min and 500texts and 25o mB of data--2 years contract vodafone is 15 euro for 300min and unlimited texts--2 year contract tmo is 300min and 300 texts plus the 24th month free for 15 euro--2 years all of these plans use sim cards so if your phone is sim compatible you can use it. i don't suggest that though because 3g might not work and really high end phones are available for free.
I assume those 5 cats are working simultaneously. If you give those 5 cats 20 times the minutes (5min x 20 = 100min), they are gonna catch 20 times the rats (5 rats x 20 = 100 rats). So 5 cats can catch 100 rats in 100 minutes.