Its not difficult to build bro. I used to use a dome.. then i made a cloner with 4 gallon RM tub..its a bit of a bitch if u dont got a holepuncher but RM tubs/lids are easy to cut.
these days i use a little plastic stationery box from staples..a 6 liter lol. i only put in bout 4 liter.. punched my holes and foil taped box and thats it. i used to be getto and just sit a sheet of foil over the lid and put clones right into holes! Theyd sit with the leaves catching the hole edges. these days i use ez plugs..
btw i use two 6 in airstones
anyway point is.. its not too hard to build
To answer ur OG guestion, fastest clone ive rooted is under 48 hrs. Yes i know its crazy.. but true. its only hapend once ..and in a dome LOL.
strain was LSD , in RRooter... crazy shit lol. next fastest time is aprox 103 hrs(snow white, Rrooter, clonebox) .. so its not even close lol