Path of Exile free to play in about six hours.

[LennyLen]

I think the Reset timers on areas is 8-15 minutes depending on the zone. Dungeons (like the Prison) are 15, while Open Air non dungeons are only 8.

Actually, I'm pretty sure the way it works is that areas with sub-areas (eg Mud Flats has Fetid Pool) stay open longer than other areas. I know I've read that somewhere, I just can't find the source.