[aephi alum]

It should be the same time frame as a regular bid extended as part of FR bid matching.

Back in the day at my school, bid day was a Tuesday, and PNMs had until Friday to decide. This gave the PNMs a chance to think about the commitment, talk to their parents, talk to their rho chi, spend some additional time with the sisters of the sorority that had bid them, etc. PNMs who deferred their bids were welcome to attend bid day and any other activities the sorority had planned (except, obviously, pledging ceremonies). If a PNM hadn't decided by Friday afternoon, it was an implicit decline of the bid. Snap bids worked the same way... a PNM receiving a snap bid could take some time to think about it, but had to decide by Friday. I imagine that a PNM receiving multiple snap bids could spend time with each of the sororities in question, but that never happened when I was an active.