modest? We used to cure 24 hour alardite in ten minutes with a hairdryer when it first came out (1963?) . It went translucent and dark brown, and was MUCH stronger.
I use epoxy a lot in model making, and always try to get some heat into it to get it runnier. It seems that if you don;t heat to cure, sometimes its prone to soften under heat anyway. No idea why..
Aircraft skins that are epoxy bonded use a lot of heat in the cure.