6 I think. I still have my first quite a rare early Gnome enlarger, the shop gave it me free on the condition I bought an enlarger lens from them and it was new, unused, but had been sat in the store for over 15 years hidden away

My main enlarger is a De Vere 5108 which I use for 10x8, 5x4, 9x12, 6x17, 6x9 & 6x6, but I also use a Durst M670 for 6x6, 6x4.5 and now very rare 35mm, and have a spare older Durst.

I've an enlarger I offered free here on APUG a Russian suitcase thing for 35mm, no takers unfortunately and a JOBO for possible workshop use.