How quickly for positive to show on LFT?

[AubergineParmigiana]

Just that really.

For those who have had a positive, did it show pretty much straight away?

I'm just sat doing one now, it's negative at 15 minutes. Obviously I'll wait it out and do a final reading at 30 minutes, but just got me wondering m how likely is it that tests that are negative at this point then turn positive at 30?

My DH had a positive that was darker than the control however both myself and one of my kids had really faint lines, mine didn’t show until the test was dry maybe even up to 20 mins ?! Mine was confirmed by PCR

It comes up almost straight away