2 months might be closer to the mark, especially if you want to got up any of the iconic trekking routes.
It'll take a couple of days to get over the culture shock in touristy Thamel, which leaves you about ten days...which is, frankly, nothing. Bear in mind it takes a day to get anywhere in the 3rd world. Go somewhere closer to home if you have a fortnight. Eastern Europe? Or somewhere you can smash in 2 weeks of frenzied travel - Japan perhaps?