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DHCP changes entered via https://hostreg.net.tufts.edu/admin are applied at 20 minutes and 50 minutes of each hour (1:20, 1:50, 2:20, 2:50, etc). New registrations via https://portal.net.tufts.edu are processed immediately.
Tufts.ad.tufts.edu
changes made in AD bind are instant, but it is ESS standard policy to make bind changes on the DNS update schedule through proteus.