Yep, that sounds right. What's the cutoff? That particular worker ran for many days in the last round, it just wasn't run in the time frame immediately surrounding the solved block due to some air conditioning issues that came up.
Afaik, there isn't a constant cutoff but rather the shares degrade as new shares come in. So the actual amount of time you can be away before a block is found varies based on the hashrate of the pool. The higher the hashrate, the quicker a share will devalue but then at the same time, the more frequent blocks are found so your expected value remains constaint. Ok hopefully I have that right.
Anyways, we did find another block later today, hopefully you were around for that one.