Web.com support

I just had a customer transfer a domain from Web.com <http://web.com/> to NameCheap.com <http://namecheap.com/>. The domain just released today and web.com <http://web.com/> deleted all DNS records, so I’m unable to log into NameCheap to change DNS because they use email 2FA. I called into NameCheap and they allowed me in, but is there any rules saying that the DNS zone should be at least up for 24 hours or something after a pending transfer is completed?