Like 3 huors orally 1.5-2 intranasally in my expirience but the comedown isnt harsh at all so dotn even worry
Althoiugh just my 2 cents here but i dont see the point in recreational ritalin/concerta/methylfagidate use its legit the worst drug ive ever tried i would suggest moving to pure amphetamine salts or meth if u want that quick speedy amphetamine type high i would say mdma but excessive mdma use damages your brain so much to the point that meth is safer than that