Without sounding a complete idiot, what is the largest spool that size this projector takes?

2200ft

Thanks david.
Would i be correct in say a two hour feature supplied on two spools would be 2 x 2000ft spools?

hi Tom. yes 2x2000ft or 2x 2200ft will take a 2 hour feature.

A 2000ft spool takes 55 minutes of film. A 2200ft spool takes 60.5 minutes of film. Both spools have the same overall diameter, but different sized centres.
The 2200ft were designed to take 60 minutes features for TV showing.
The running times refer to acetate prints, films on polyester stock will run slightly longer.