It really depends on the stones you use, condition of the edge, type of metal, and method you use.
If I want too touch-up my S30V millie (EDC) I usually make 3-5 passes per side on my diamond finishing hone. Time spent, 2 minutes?
When I reprofile its a completely different story and many more factors come into play. If speed is needed and the steel is not too difficult to work with I'd say 15-30 minutes and you should be able to finish while still maintaining control and not being too sloppy. If perfection is the goal time is no longer a factor and working to the best of your abilities is the only concern.
Its really a hard thing too put a number on because of all the different factors, experience being a big one. I could tell you how long it would take me to sharpen a edge but that number might be useless to you simply because we use different tools.