How many hours can be covered if I choose dog daycare? a full 8 hrs? Charged for OT?

I use a same dog sitter who did a good job on our first try of "Daycare". But always being notified by a dog sitter about picking up time. Daycare does not mean 8 hrs? or should we pay for OT if over 8 hours? the first daycare, a sitter told me to pick up my dog by 5pm (dropped off at 9:30a, so total hours was less than 8) and this time (2nd) being told to pick up by 4:30p (drop off time is set at bet. 9~9:30a, so appx. total hrs is 7 hours only). I need http://Rover.com clarification about the time period about "Daycare" and "Boarding" Thank you!