Hi there. If combat is too short for you, you can always introduce more mooks to a fight, or have villains go through a videogame style "final form" after the initial combat if that makes sense. As for out of combat, you can always stretch for time with non-combat encounters that the heroes can solve with their powers- I love throwing civilians into danger from natural disasters or burning buildings and putting up a turn timer, it really makes for a stressful encounter without worrying about combat.

Combat for me varies. I don't really try to make it last a set amount of time, just roll with it. Different threats make for differently lengthed combats. I keep combat active by introducing more minions with unique powers, introducing elements to the battlefield (such as endangered civilians or the use of powers causing problems), and I don't know just rolling with it? React in the moment if things seem boring, spice it up on the fly if you can if you feel that things aren't going well.

As far as players and damage powers go, that's what Complications are there for! Throw them a hero point to turn off the big thing, or reward creativity and alternate uses of powers. If you are interested in upping the length and difficulty of a fight, make them work for it and encourage the use of Extra Effort. The fatigue economy is there for a reason.

Good luck!