didn't understand this one - can't you explain it to me?

Author's Response: Sure, I'll explain! It would have been more obvious if it could have been over 55 words! So the "eight minutes and thirty five seconds" thing is the time they spent in his car together. The first few chapters were in the rain, right after he proposed, but this one is a few minutes after they went into his car to, well, you know. Spend some "time" together. ;)