Hi - what sort of climbing holiday are you looking for? We work closely with a IFMGA guide and a BAIML/MIA to provide bespoke packages with as many or as few days as you like!
I've always gone independently but if you want an organised hol I believe Colletts (colletts.co.uk) is the stock answer - can't recommend personally though, as I haven't used them.
I'll be travelling solo around Europe for a few months, so without a climbing partner I would be looking for anything from a full week's climbing holiday, to a day or two with a guide to do some multi-pitch routes.