Just putting a new one together for the Mrs and I was gonna re-use my Marzocchi XC700s. These have travel-adjust, so what sort of maximum should I be looking at? It'll not be doing any drops etc (LOL)

i think its 5 inches

i had 130mm revs on my white inbred and it was fine!!

130 is the recommended, but i asked Brant when i ordered mine and he seemed to think that 140 vanillas would be ok.
although that was based on me singlespeeding and being stood on climbs, it might be a bit wandery otherwise.

I found 100mm too low. So I would say 130mm would be a good bet.

tbh i had to wind my forks down for steep climbs as the front end would wander a bit!! wound down to 100mm and they were fine

run 130 on mine, up is fine, down is fun

I've had 115, 130 and 140 on my 'Breds

115 is quick steering, climbs brilliantly, but I wouldn't go any less personally
130 is perfect, IMO
140 (Which I have now) is only slightly wandery on climbs and perfect everywhere else.