How long can they do that for?I think they are living there on a tourist visa and doing a visa run every 30-39 days.
Today they are off to Abu Dhabi, a month ago it was Georgia, month before Bali. There is a picture of Darren with Karma about a month before that saying they had a weekend at Hatta which is on the Oman border.
Definitely looks like they are leaving every 30 days to renew their tourist visa and I can see how vloggers with no ties or employment in the country could get a visa to stay there.