When I do my own toes it takes me about 3 hours to do full prep, 4 small toes Minx/wraps and the big toes in crystals.
It takes that long and sometimes longer on me as I like to try and strech my legs and back as often as I can during the service and I usually end up having some sort or patern or other in my crystals not just all one colour crystals (& my toenails are always nice and long too lol).
On a client I allow 3 hours - to set up complete the 10 toes and pack away again and leave - the actual prep, minx/wraps aplication and crysatal aplication in gel prob takes about 2 hours without interuption (but that is a very rare thing - clients usually need the loo etc. as well as talk lots) I too am a perfectionist (& it is a curse for me in this industry).