This really is a bit like asking how long a piece of string is.
It all depends on the design i am creating, weather i am tipping and overlaying , sculpting,if the client is a nail biter...if i am sculpting with acrylic glitter producing a fade...If i am creating 3D acrylic designs...
But in general if you are referring to a full set of pink and white french,thats with white powder and not cheap nasty plastic white tips...1 and half hours..at leisure.If i have a busy diary and am working under pressure i can do this in a hour.I have been known to do a infill/rebalance in 40 minutes..but then i have been doing this for 10 years now
For a newbie/ graduate its quite normal to take up to two hours.The more nails you do,back to back in a salon environment the naturally quicker you will become. As a salon owner for me its important for my staff to create a beautiful set of nails,in proportion with out compromising on health and safety as opposed to a "quick" set of nails.Its all about quality not quantity at first.
A decent salon/owner should take into consideration your experience and book you out accordingly...eventually your times will reduce.