Ummm you've never heard of prep work for a show?
Similar to the long period where Erron was based at TVC when the show was still at TLS
, making sure everything was in place for broadcast day. It doesn't matter if it is for one morning or for the rest of time, preparation is still required.
5 days is quite a long time if it is just prep work for simple OB inserts into a morning news show. IF it is just simple OB inserts that GMB are doing... Moving an entire show into a new studio centre is a slightly different kettle of fish.
However there may well be requirements for broadcasts in the days before the Oscars - and Erron may simply be taking the opportunity of having some personal time in LA before he needs to work.
It's certainly not unusual for staff working on overseas deployment to pick up their own hotel bills for a day or two, particularly if there isn't a major flight cost increase in going earlier than required, or coming back later. Many employers will also pay for a 'rest day' if they fly you out economy on a long haul flight. (If you are lucky enough to fly business, where there is a more realistic opportunity of getting some sleep, you may not get a rest day)