idk. if i remember correctly he has been known to take a week + a day in instances like this before. so my guess is he will be back next tuesday.
Good point. Around this time the past few years, he's started the AGT stuff, so who really knows. Based off a quick search, his work on AGT started in 2012. Under the first Sirius contract (2006-2010), it was easier to think of it as Howard working so many weeks per year with Fridays off. The last contract went from 2011-2015, but he worked X number of days. All he really did was take off four consecutive Thursdays instead of a Monday-Thursday.
So, in reality, who really knows. You'd have to go back to 2011 when Howard didn't work AGT, but that year, he didn't work Memorial Day week...but that was when they were still alternating live Thursdays with This Day In Howard History...and having Lisa G preview the Howard 100 News live on the show.
Soooo...in other words, I don't believe we have a precedent for this.