I file by hand and have never used a drill but I am very interested and thinking about getting one.
It is about 60 to 90 minutes for me to put on a new set of gels with tips by hand.
Around here there are next to no nail shops, nail bars, etc... it is all spas with aestheticians and few nail tech.'s or hair salons with a few nail tech's and only a few of these places use electric files.
The ones that don't use them (including a place I worked) gives reasons for why they don't use the electric ones... like.. they damage your nails, we are doing it naturally to better the clients, the electric files hurt and make red rings in your nails, etc... when infact I know if used properly and if the tech. had training with one, no damage should be done either way. Right?