And it's hardly like my Haswell i7-4790 is a slowpoke either. Most of the discrepancy between my numbers and @NiLuJe's should be because I was using a debug build.

If I'm not mistaken mine should be some 10-20% slower at most, possibly slightly higher under specific workloads.
I'd give it an absolute minimum of 100 minutes on an actual H2O/One given the numbers we posted, more likely easily twice that. (And if you run into heat-based throttling… who knows.) Hardly worth attempting unless you really want to verify whether it'll run out of memory along the way.
Code:
$ inxi
CPU: Quad Core Intel Core i7-4790 (-MT MCP-) speed/min/max: 1038/800/4000 MHz Kernel: 4.19.0-5-amd64 x86_64 Up: 1h 48m
Mem: 5603.5/32112.8 MiB (17.4%) Storage: 3.87 TiB (54.4% used) Procs: 295 Shell: bash 5.0.3 inxi: 3.0.32