what about duration of the effects? I found that taking only sublingual without swallow last less then half the rue tea but the dosage is different so I'm not sure if increasing the sublingual dosage is going to increase the duration as well

since absorption rate between two methods will be different, peak concentration and time needed to reach that peak concentration will differ
How much? we can't know for sublingual harmalas since there are no scientific papers (or at least I have not read them), but at least we have some data about the peak and time needed to reach it if for oral dosages. So basically you will have to rely on isolated reports from users and your own experience to reach a conclusion
obviously taking more sublingually will increase the duration, but from my experience it is easier to overdose sublingually

This is something about which I've been thinking recently. My feeling is that the oral route has an extended duration because there's a larger amount simply 'hanging around' in one's system due to the higher dose requirement. Sublingual is absorbed more directly and bypasses the gastrointestinal metabolism hence the (substantially) lower dose requirement.

And I hoped I've achieved a suitable balance of simplicity and actually making sense here!