It doesn't seem as though it's likely to take hours, as his sleep is more of a restless doze than anything truly restful at the moment.

Gabriel mumbles something else, and then comes awake with a small, reflexive jerk.

It takes a moment for him to truly recognize her -- or perhaps to believe that she's actually there.

"... Mary?"

His voice is rougher, too, harsh and strained, but it's unmistakably his.

"What are you doing here?"