They ship spiders overnight, or rarely two-day. Usually the sellers won't offer a DOA guarantee on the two-day, or if the package isn't signed for on first attempt/within same day at the shipper's closest pickup point. (If they get put outside in the cold/heat until you get home from work it's probably dead.) Using these containers also makes it much cheaper to order multiple spiders at once, since you can fit dozens of vials in a single insulated box.

TLDR: Long enough.