super quick afk tower booster fireballs hit for over 7 million damage when oiled and passed through webwall 

first wave upgrader with monk tower boosting

next wave jester up have fire pet on and wheel in between ogres dont stand a chance you can even have fire damaging pet on your tower booster just keep dropping mana towards him to keep boost up

each wave took me around 2 mins 30 to 3 mins  with 2 afk summoners brought in last wave one with 2 monk guards other attack and speed time to clear will depend on your stats i was hovering around 6.8k damage average across each hero