Half of 27 minutes is less than what foye deserves, and you probably know that. He is one of the best three point shooters in the league, but can't do much else. He should be playing less, yes, but less than 15 minutes a game is a waste for that caliber of shooter. I think he should be playing about 20 minutes per game.
He was one of the best three point shooters in the league LAST YEAR on a mediocre/worsened team that was worse with him on the floor. The list of guys that can spread the floor grows a lot when you stop looking for guys that can defend or rebound at all.