There is no formula to offer and it's dependent on very many factors. Most of these you will only be able to judge after you've played for quite a while. Two things though: none of the concert guitarists I've met and worked with over many years had nails that were as short as being advised but, of coures, it's their career. More importantly, in my own experience, if you let the nails grow longer, and put up with some negative issues as they do, you'll find they are a lot easier to shape and, at least to some extent, mould. At that point you can come to your own decision as to what you prefer.
Paul Croft aka PP.
"PercyPenguin is the greatest creative genius I've ever known." Mark Gaultier.
St Paul's All-Rest-Stroke-School now accepts lutenists.
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