Nobody only spent 10s on linking. For any reasonable sized binary (in the range of 100 to 200 MiB) it is somewhere around 50s to 60s before mold. People regularly links 1GiB binary for living during their development cycle. If you use small binary or primarily using Go, probably not the target audience of mold.
Otherwise I actually agree mold is amazing but have limited commercialization potential unless author expands the scope (like RAD Game Tools) / take some VC money (much like Emerge Tools)
I work in video games, and all the game projects I've worked on for the last 10 years or so have been multi minute link times. We predominantly iterate on windows with MSVC, and it's usually "server" binaries that are produced for linux.
Afraid I don't know how long it takes with mold, sorry!