Not all rebuilds take months. I rebuilt my motor in 3 weeks, it takes a lot of dedication working on it at night and weekends. The longest part of my build was shipping the shortblock down to a builder in L.A., and waiting 1 week for it's return. The only other issues if a part where to break during the install, the additional time it took to track it down and have it shipped. My rebuild cost less than $6k. (recondition block, CP pistons, balance, pressure tested heads...etc)
1 month is very doable as long as you have done your research and made your contacts.