Fifteen minutes is a solid amount of time to get yourself in order. If you're an everyday shaver, it's a good idea to get warmed up in the shower first and give your face a chance to deflate. The hot water will de-puff morning skin and make shaving a whole lot easier.
Once you've got your technique under control, a good shave should take about seven minutes, leaving you a few more to dry off, put on some pants, aftershave balm and a workable hair product. Keys, wallet, phone, door and you're sorted.