The control line shows up fast since it’s going against a protein that you got plenty of in your nose or throat. It needs a little amount of material collecting at that line, that’s why the line comes up right away the moment the fluid passes over it. The other one can detect smaller amounts of virus, and this takes more material to flow over the area in order to collect enough “color readout”.
Everyone (4 people) in my house tested positive for Covid recently. For 3 of us, the line showed up right away. For 1 of the adults I live with the second line showed up 10-15 minutes later. We thought it was weird she didn’t test positive and then noticed the second line just took longer to appear.
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