Oryx hotel is in airport and dont need visa to go there. also 11 hrs is not too much coz even if they dont want hotel they can stay in a lounge and get free food vouchers. also there are lots of nepali working at the airport so they wont have any problem if they stay in the transit or in the lounge. dont eben bother abt visa and all. Qatar airways will also give them bed to rest inside the airport.