How many RCs? Shit tons. I mean there are hundreds and hundreds of stimulants, and probably even more canabinoids. If you just count psychedelics, there are well over a hundred, maybe 150 if I had to guess, maybe even more. I personally have 65 of them in my collection and there are a lot I am missing.
DOM, DOB, and DOC are all psychedelic amphetamines, they are technically ampjhetamines but they're metabolized very differently so they're not like trippy adderall or something. They're some of my very favorite drugs, they last a LONG time though. Personally I have or have tried DOB, DOC, DOM, DOI, DOF, DOiP, DOPr, DOET, DOT (aleph-1) and there are others too that I haven't tried, like DON, DOEF, DOTFM, and others are piossible too but to my knowledge have never been made. They're all the same base structure with changes at the 4-position, ie, DOC has a chlorine atom on the 4-position, DOB is a bromine, DOM is a methyl, etc.
DOC lasts 16-20 hours, and DOM lasts 12-16 hours. But there are longer ones. DOPr lasts 30+ hours. I took 6.6mg last year, and I was still tripping 40 hours later and had to take etizolam to sleep. Despite the extreme duration, DOPr was one of my favorite trips ever.