You figure Hill is going to play his minutes exclusively at PG from now on. As a starter (PG/SG) Hill is averaging almost exactly 35 minutes a game. I doubt it goes up that much higher. Thus, there will be about 13 minutes, give or take, at PG.
Manu is averaging about 27.5 minutes; though he has only played a hand-full of minutes at PG this season (the bulk have been between SG/SF). You may be able to push Manu up to about 30 minutes a game. Playing him exclusively at SG means you still have about 18 minutes at SG to fill.
In all, there will be about 20-25 minutes to be filled at the guard spots. So, there could be some space for Hairston there if Mason goes back up to his 20 minutes per that he was averaging earlier this year.
Of course this is not taking into account any sort of demented small ball lineups that Pop may trot out. If that happens, there maybe more minutes than expected for Hairston.

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