I keep gels on all the time - I can make mine last about 3 weeks, but at that point the growth of my nail is beginning to be too obvious near the cuticle.
I guess I need to find a new salon though - they do have me soak in acetone to remove and this last time, I noticed that my nails are really dried out. It is worth it to me though - I have never been able to keep regular polish on for more than a day or two without them looking like a mess.
I've done both French and color, but French is my usual. LOVE them. I can't imagine NOT doing them for vacation.
When you say gels, do you mean gel nails or the shellac/gelish./hybrid manicure? The gel nails are a completely different animal.