[MetroMPG]

Here are some ballpark figures about deep cycling conventional starting batts: 30-150 cycles.

Golf cart (flooded lead acid) batteries are much more robust (fewer and thicker plates):

For example, golf cart batteries will average 225 cycles at 80% DoD and increase to 750 cycles at 50% DoD. - source

I don't have any gel figures, but Google is your friend!