The conditioning level with my sensei is VERY demanding. 1/2 the class is assed out by the time we begin learning techniques (~15 minutes in). Also, you determine much of your own workout.
I pretty much strike 100% force all the time, unless I get partnered with someone who isn’t as physically stable. That’s when I strike a lot weaker, but tend to try to strike faster yet maintaining my form. Some people have said that I strike (punches, palm heels, and elbows) harder when I look physically exhausted, but I give up form. However, no matter how tired I am I’m pretty much always going 100%.
You also have to remember, some of krav is also learning how to take a hit…
Your Krav experience will also greatly be based on how good your sensei is. Our senseis are awesome, keep in a ridiculous shape level, learn all sorts of techniques (sambo, bjj, mma shit, boxing, muy thai, kempo, ninjitsu, blah blah blah). They kind of intertwine that with what we learn in Krav - like we know all these chokes and kimoras that normal level I students around the country don’t know.