The effects on marijuana can last up to

The duration of a marijuana high is highly dependent on several factors, such as chronic (medicinal or recreational) use, polydrug use, etc. But generally, marijuana highs usually last for about 2 to 3 hours. A typical high from smoking marijuana lasts for about 2 hours; orally ingested THC or marijuana can trigger a high that lasts for longer: about 4-6 hours.

Jet streams are relatively narrow bands of strong wind in the upper levels of the atmosphere. the winds blow from west to east in jet streams but the flow often shifts to the north and south. jet streams follow the boundaries between hot and cold air. the earth's rotation is responsible for the jet stream as well.