Invoice Indexing

Im using this format 2014-00 as specified in admin. Will 2014-99 be the maximum before the the counter starts again at 2014-00 or can the 2 digits be given larger numbers in the hundred or thousands?

You can use 2014 as invoice prefix and then you got 11 digits left for your invoice number.

So if I use 2014-00 in admin this number in the invoice can go up to 2014-99999999999?

Or do I need to set this in admin 2014-00000000000, I have tried this however the invoice number keeps incrementing by 1 and not 00000000001

Try starting it at 2014-00000000001