Why are 600k HP fights in AQ 3min. but 250k HP fights 15min?

Day 2 of Epic (highest) mods in Map 7 has sasquatch of just under 600k HP at 3min. tops. While Rocket fight is 250k~ at 15min. timer. Whats the point of that? Why cant all AQ fights also be upped to 5 mins at the very least?
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I havent even played map 5 yet
But it depends on your roster and your references because you might end up having to use your best champs in AQ and some people don't like that
They'd be dead before I even reach one bar of power 😪