I doubt modders have to jump through the same hoops as developers working on the actual game.
Working in the software development industry, the only thing I can think of that would cause them to take longer is any contracts, licensing they would need to work with but given that dlss is free and nothing is required from Nvidia to get the go ahead (and amd have stated there is nothing blocking Bethesda from implementing dlss). From a technical pov, there is zero reason why they couldn't implement this very quickly especially since the game has motion vectors and fsr 2 thus means implementation of dlss would be less than 2 days (and amds own pr articles show this too).
The only thing that would take longer is going through QA/testing to ensure it doesn't break anything but this is Bethesda, not exactly their strong point....
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