How long does it usually take for a divorce in Ny to be final once the papers are signed, and will I have to wait to be remarried in mass.

That depends upon the county in which it was filed and the backlog of cases in that county on the day you file. Some counties have almost no delay - others have up to a year. If you have a reason (such as an imminent remarriage) it is sometimes possible to obtain expedited handling of your case.