Ime DMT can be orally active at different timings, however the maximum bioavailability/oral activation of DMT occurs an hour into the Harmalas when gut MAO-A inhibition reaches it's max. Whereas if i take DMT say 30 minutes after Harmalas, sure it's active, but it's not as strong and doesn't seem to last as long as when dosed an hour after the Harmalas, due to gut MAO-A not being fully inhibited around 30 minutes in. Same thing i've noticed with Tryptophan for Tryptamine activation, and for Psilocin potentiated for Psilohuasca, it seems an hour into the Harmalas is best since gut MAO-A is inhibited to the max. 30 minutes apart can still work though i reserve 30 minutes apart for if i'm taking like Mimosa or Acacia root powder encapsulated or mushroom powder encapsulated or eating mushrooms, but for Mimosa/Acacia teas, for mushroom tea, for 4-ACO-DMT, for Tryptophan/Tryptamine, an hour into the Harmalas is ime best.
Also no need to take more than one Harmala dose ime, just need like 180 to 200mgs of Harmalas, and an hour later take a good dose of the DMT or Psilocin and you're good to for a full nights journey. The DMT will last 4 to 5 hours in total duration, the Harmalas will last 6 to 8 to 10 hours in total duration depending on dosage, and potentiated Psilocin will last 9 to 12 hours in total.