Minimum rest is set by the GCAA not Emirates. The UAE GCAA sets the FTLs, following closely, international standards. There are a few variations.
Contacted There's bucket loads of variations, here is one example. EK ULR FTL's max Flight Duty = 22 hours with NO MINIMUM rest period after completing such a duty.
There is minimum rest stated under the normal FTL rules however the ULR flights and pairings are a different kettle of fish and this over sight was a brilliant commercial decision don't you think ?
A line of thought is that as the ULR scheme is approved by the regulator then it must be OK ?
CAR-OPS 1.1130 ULR OPS and CAAP 14 ULR Operations documents available for download on the GCAA web site for what is expected of a ULR operator in the UAE.
International Standards for ULR Flights ? There are none. GCAA mention on their web site that they view both ULR operators in the UAE as pioneers in ULR operations. Look forward to more ground breaking FTLs coming your way sooner rather than later.
woodja51 comments are on the right track.