If you’re gaining keep doing what you’re doing until the gains stall and even then more food may get you moving again. I wouldn’t change a routine that was working well.
Also, there’s no way to psychically prognosticate about numbers like that.
I will only be doing this program for 10 weeks and then i’m on holiday for about 5 weeks (no weights).
Would i lose some of my gains in this time?
Also, when i’ve finished my regime and i’m on holiday, should i still try to each around 4000 calories per day?
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Because there are no weights wherever you will be while on “Holiday”? Are you going on “Holiday” climbing in the Swiss Alps? The Sahara Desert? A secluded Brazilian rainforest? Some other location where there are simply no gyms within 50-100 miles of your location?
I will only be doing this program for 10 weeks and then i’m on holiday for about 5 weeks (no weights).
Would i lose some of my gains in this time?
Also, when i’ve finished my regime and i’m on holiday, should i still try to each around 4000 calories per day?
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Are you not bringing yourself? Ever hear of pullups, pushups, air squats, and Hand stand pushups? And won’t there be heavy things around you can lug around, pick up or push?
Even if it is your wife/girlfriend? If she weighs even 100 pounds hold her on your back and do lunges – try that and tell me you don’t get a work out!