When you dissolve blackheads with cleansing oil, how many minutes do you leave it on?

What should I do about these dark blackheads popping up around my nose? I heard that forcibly squeezing them out widens the pores, so I tried the method of gently dissolving them with cleansing oil. I heard that if you apply the oil and massage it gently by rolling your fingers, the sebum comes right out. So I've been rubbing it in quite diligently, but I have absolutely no idea how long I should massage to be safe. Wanting to dissolve the blackheads completely, I got a bit greedy and kept rubbing for over 5 minutes, and the area around my nose turned red and started stinging and irritating. On the other hand, if I just rub it roughly for less than a minute and wash it off, it feels like the sebum isn't dissolving at all and is still there, so it doesn't feel like it's working.