Mine currently is up to about 3.5 hours of gameplay from beginning to the point in the quest I'm at. I'm planning another few hours of "main quest".

Aside from that there will be a fair amount of side quests, some involving combat, some involving puzzling around.

Once I have the MQ done I'm going to step back and polish it all up to make sure it's as perfect as I can get it, during that playthrough I'll decide where the player could use a break and implement level specific side quests in those places.

Combat balancing is going to be a nightmare, not looking forward to that. I really wish save games were easier to keep in place after making changes in the editor. It would be so much easier to test, load the editor and make a change, load the save and test the change. Oh well.

I can't wait to release it though, but first I'll likely look for help testing it here.