"Oxazepam has a slower onset of action (30-60 minutes) than some other benzodiazepines (such as diazepam).

Peak effects are reached in two to three hours and the effects usually wear off within six to eight hours which means oxazepam typically needs to be taken three to four times a day when used for anxiety."
(Kilde: https://www.drugs.com/tips/oxazepam-patient-tips )

Er du ute etter "peak" samtidig på stoffene, tenker jeg ca. 2 timer før fyring