Yes, some dispensaries stay open 24/7!
Presently, only Recreational Cannabis Dispensaries in North Las Vegas are allowed to stay open 24 hours, everyday.
However, the Oasis Dispensary Cannabis Dispensary located at 1800 S Industrial Rd #180, Las Vegas, NV 89102 is now open 27/7 too.
Note: More Las Vegas Cannabis Dispensaries will soon be allowed to operate 24/7 too.
Simply check their listing.