This question came up during a game session while the party was fighting a beholder.
When a character, wearing a Ring of Sustenance, is affected by the Antimagic cone of the beholder, the ring's effects are supressed. Does he have to wait another week to regain the benefits of the ring?
Our DM didn't get much into it (i think he didn't remember this until someone said something
) and just ruled it as "Yes, you felt hungry momentarily during the combat, but you're ok now...".