How long you make love when TTC?

Hannah • TTC #1
Hello ladies,
I was actually wondering if how long supposed to make love when trying to conceive? Would it be matter if short or long period of time? My hubby and I been trying to conceive for 6 yrs now, we want it to be natural as much as we can, but ofcourse am getting exhausted and upset everytime there was a BFN. So we did tried several treatments, but still no luck. But my point now is, how long it should last when making love? Would it be normal if it last just for 10 mins and so?