Depending on time of year and weather conditions ATF can be 3-4 months.How long dose getting the FFl take.
From what I get I/we will need to get the place rented first . So you got money tied up for x months till you get the green light.
MA is MA, depends on department and town, but plan on 3-4 months there too.
Anecdotal and personal experience, YMMV and that assumes no one needs to be "convinced" to approve, but is just working through the process of background checks and confirming zoning. Personally, I wouldn't go into it assuming anything less than 6 months with things going smoothly...
That also excludes any time that you spend on the lawyering and accounting side...