I have done my own with a proper press three times, with a harbor freight press once, and with a 3lb sledge and a chisel once. The last set was on the trail with no spares on hand except a used set I happened to have with me.
In no case did it take longer than two hours to do each side. With proper tools (good press, press adapters, 3lb sledge, 12pt 13mm or 1/2" socket, breaker bar, etc) it takes about an hour, if that. Hell, it took an hour to get it back together on the trail, and about 2 to redo it mostly-properly when we got back to camp.
I live in the rust belt and have never had to use more than one hand on the wrench tightening the press since I use the hand sledge trick - crank the press down till it feels pretty tight, then tap the side of the inner C where the balljoint is pressed in and it'll 'pop' loose. Rinse, lather, repeat.