I file my nails around twice a week, which keeps my nails in good practicing/performing condition all the time, rather than having to endure a few days that are less than optimum. Once you get the hang of it, it doesn't take a lot of time so it isn't too much of an inconvenience. I never cut my right hand nails as this creates a harsh edge and it becomes harder to shape, while filing with a good quality nail file allows you to take just the right amount off while shaping and leaving a smooth edge. If I'm not mistaken I remembering hearing that Segovia filed his nails like 3 times a week.
I recently purchased a "ClassyLady" glass nail file from ama zon. Aside from the awkward name, this is hands down the best file I have ever used and I find it a step above the one I purchased from SBM. It is longer, more substantial, and all edges have a fine grit that leaves my nails decently smooth and ready for polishing. Then I use the 4000 and 6000 micromesh papers and nothing else. I stopped using anything above 6000 because for some strange reason the 6000 grit has given me the best tone. It saves me time and money not having to use any of the other micromesh grades. After this I am going to try the "3M 500 Grit Open Coat Sandpaper" from SBM as this is the exact sand paper that Christopher Parkening uses and recommends for polishing after filing. If I can shorten the process to using just one piece of sand paper to polish rather than multiple grades, that will cut the time down even more and will save me money.
"Success grants its rewards to a few, but is the dream of the multitudes.
Excellence is available to all, but is accepted only by a few." - Christopher Parkening