This was maybe 10 minutes into the shooting session, and I had shot maybe 35 minutes in total.
I haven't had any overheating issues. But then again I've never shot more than 40 minutes of footage at a time.
I do feel my gear get warm maybe after 30 minutes though. But I only notice it when I'm changing my battery which doesn't last very long anyway.
The longest take I've ever shot was maybe 15 minutes. In either case it hasn't been an issue for me.
But I would play it by ear if I were you, especially since you're dealing with a different camera than I am.
You feel it's getting too hot, let it cool for a bit and then resume.