Nah, I reproduced on 4x 7900 XTX machine in 8.75 hours, so a single 7900 XTX (costs less than $1k) could do it in under 24 hours. Was hitting 55.4% MFU.
Do you have a link to a description of your setup? I assume there are some quirks on the way and getting this done requires some substantial work. A submission on that would be very interesting, at least to me.