Igniters per cue

Just trying to put together something rough for the time being for this years display. I’ve got a MS32Q firing system.

I was just wondering how many e-matches can you have per cue In series wiring ?

last year the most I had was 3 in a series but I could do with 4 this time. Would it also depend on how long you extend the ignitors so they all still have enough power ?

Any help would be great as always