Does swimming burn as much calories as MFP tries to enter?

LavaRoushFiveOh

I swim quite a bit at my dads house. Maybe 2 hours of leisurely swimming at least a few times a week, but when I put that in MFP it adds a large amount of calories burned and it just doesnt seem right. I mean yes I don't really stop moving and I swim around a lot but it is really that much of an exercise? I realize that swimming laps in a 100ft long lap lane is a wonderful exercise. I do that when I can at the YMCA.