really i dont think it matters as long as you dont die and can kill them before they respawn, you should be golden. Their timer is about 10 minutes, so its not that hard really. Its just more FUN to pull them all at once.
Admittedly if you can down them faster u can probably find something to do with the free time, I spammed city trade on my bank toon one weekend between clears, or you could include more mob groups if you can figure out how to do the ones on the path in a way that works for you.
_________________
"And were I e'en to die, the cursed enemy would not tear his gaze from me for fear that I should rise back up."