Question about digital clear blue hpts

Lovely • IG: MakingBabyDay TTC #4. Sept 2014 tubal reversal. Feb 2016 HSG: blocked tubes. May 2016 IVF: failed. Aug 2016 BFP turned to 4th loss
The clear blue test that tell you how many weeks you are... Does anyone know how long the results stay on the window? 10 minutes?