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If you're having problems with litter, get some of this: http://www.amazon.co.uk/Worlds-Best-Cat-Litter-Clumping/dp/B009ZUGJIS/ref=sr_1_1?s=pet-supplies&ie=UTF8&qid=1457348577&sr=1-1&keywords=worlds+best+cat+litter
Terrible name but it's not incorrect. Completely removes odors and clumps around the poo / wee so that you only need to remove that bit (less wastage). Also, as it's made of corn husks, it's biodegradable and can be flushed.
Get a scoop with plenty of holes in it, carry the litter tray to the toilet, scoop bad bits into toilet. Flush.
So much easier.
I would say 3-4 weeks.
Make sure the first time you let him out, it's before he's been fed so he's hungry!