Your wording is difficult to understand, so I'll say this - without MAO inhibition, smoked dmt fades in effect from my perception within an hour.
However, smoking/vaporizing after having ingested harmalas, or I suppose any other applicable MAOI (a subject I am admittedly ignorant of) will prolong the duration and potency of the DMT being inhaled greatly.
As far as tolerance to smoking, hours waited between vaporized or smoked doses is optimal, because a tolerance is formed nearly instantly, however it is short lived, with the course of a day being enough to fully 'recover' as far as smoking for maximum effects.
Drinking DMT and smoking it do not form a cross tolerance IMO/experience; as I noted, something the opposite is created, due to the MAOI effects.