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Peak levels and half life of LSD. LSD has a plasma half-life of 2.5-4 hours. The onset of LSD effects is rapid following intravenous administration (10 minutes) and slower when taken orally (20-30 minutes). LSD effects usually peak at 2-4 hours and gradually diminishing over 6-8 hours. Residual effects may last longer but usually resolve within 12 hours of dosing.
How long does it take for adderall 20 mg to kick in? It takes your body on average anywhere between 30-60 minutes to feel the effect of most pills-including adderall, unless they are in gel (or some sort of rapid release form) â¦ . Answer:   Anywhere from 48 hours to 72 hours, but it could be longer depending on high often and how much you use.