His...sleep. Strange just pauses for a moment, blinking slightly as if that'll help him understand just what sleep has to do with anything. Oh, he's got plenty more questions about Solas and Mythal and how all of this is a very nice story but this doesn't change what Solas is bound to do, but that bit about his sleep is confusing so that's what Strange is going to focus on.

"You're speaking metaphorically, I assume?" He had to be. Because if not, then...by the Divine, that's a long time. Sleeping for thousands of years?! Modern elves couldn't even last a sliver of that time, how precisely could Solas do so? That sounded particularly godlike, no matter what the other man might say.