How to farm multiple locations:
Step 1: log in your main account
Step 2: make a trial account with your battle net
Step 3 (optional): turn your trial account into a one time month $15 sub account to make an another trial account. Repeat if you want more accounts
Step 4: wait for Dr boom
Step 5: find Dr boom
Step 6: use your 2 (or more if you’re willing to spend) characters you logged in to kill and loot Dr boom
Congratulations you have significantly lowered your farming time