How long micardis (telmisartan) stay on your system after you stop using?

It takes 5.5 x elimination half life for a medicine to be cleared from ones system.

Telmisartan half-life is approximately 24 h and total plasma Cl is more than 800 mL/min. After IV or oral administration, more than 97% is eliminated unchanged in feces via biliary excretion.

https://www.drugs.com/ppa/telmisartan.html

I would take approximately 132 hours i.e. 5.5 days for telmisartan to be cleared from ones system.

Telmisartan can cause erectile dysfunction ... and should resolve once you stop using it. It may not automatically get back to normal as soon as the medicine is out of your system ... but soon after. All the best.

https://www.drugs.com/sfx/telmisartan-side-effects.html