A good multi perhaps a minute or 2 for a 3 baller say MB or SM
Spidey is of the easier one to keep multi in play.

I have maybe kept all 4 balls on METLE coffin lock in play for 30 seconds or so

BTW casket/coffin multi ball would easily be my all time favourite multi, just epic !

My greatest multi achievement goes to TZ
a few years ago I managed to land and convert 3 balls playing on the mini PF one after another
man did that put a smile on my dial !

Ando

In my opinion, the point of three ball multiball is two ball multiball---the third one just lets you get everything under control more safely.

For games with particular jackpot patterns, like TZ or Addams, a good multiball is multiple trips around the pattern... however long that takes you

Yeah, it really comes down to holding as many as possible on one flipper and trying to pick off whatever from there.

There are games that reward you more for the balls you have in play, LAH, if you can keep all six going gives you 300m for the regular jackpot, and 600m for the super with all six the second time through. That super along is likely more than most people's GC on this game.