it's two weeks.. frontload your long esters(If you want me to actually write it out step by step with approx amts in your blood each day I will..) seriously bro, you can live without the mast til you return(but you can double dose that before you leave for e2 reasons, too... like digitalash said, take short esters upon returning(great idea!!..tried to rep him, but damn it, I gotta spread some around first:-(..)
so, seriously... the last week(2 weeks if you have time) before you leave take what would amount to double your dose(or even a little more, so you have good blood levels still upon returning).. but dose daily... that way, each day you are increasing your blood levels to keep them consistent every day you are away....and you will still have elevated levels when you get back...
example

this is just an example... base it off your own doses you are currently using)
lets say you are using 700mg test e and 350 tren e(just an example, but makes this simple to understand)
2 weeks out(2 weeks prior to leaving)
200mg test e ed(this doubles it to 1400mg/wk, but it wont actually be active til right before you leave)
100mg tren e ed(this doubles to 700/wk " " ")
1 week out
200mg test e ed
100mg tren e ed
starting 4 days out, dose mast at double dose ed
so....a few days before you leave you will be at the half life point of the enanthate esters...your test and tren levels will actually be increasing through nearly your entire trip... and actually peak right before you arrive back home....so, like digital said(hit it with some tren A and test P for a few days, along with the test e and tren e)... then, after a week home, drop ace and prop....
the masteron will be increasing about the same time that you will begin to have more aromatization from the extra test, nearing peak level by end of first week, then progressing downward.....and down to a low level by the time you will be arriving home...(take formeron.. and caber with you )
hopefully you have somewhere to work out abroad, and plenty to eat... cause you are gonna be a raging animal if you can't(at least I would be)...you will have blood levels about 1.5times higher than your 'cycle' levels toward the middle of second week abroad...but, they will be slightly above normal when you get home, giving you time to 'catch up'...even if you don't have short ester on hand..(though short esters would be ideal)