Well killing every single enemy in a lvl 24 strike could make the strike last upwards of 45 minutes were u may only get 1 or 2 extra blues so lets say the rng after the game is good u can get 6+ blues if ur lucky were as if u speed run and maybe take 15 mins u can run almost 3 and lets say again the rng at the end of the game is good u can be looking at 15+ blues jus from rewards. After the last patch it is far better to speed run than kill everything