As someone with addiction experience I would say 2 months at least. Benzos take a good while. They will start to get their kick back after a couple of months abstaining but they won't be at full tilt without a couple more. As N acts on the same receptors I suspect it will be the same/similar. However the length of previous use and doses used will impact this so a short stint of relatively low dose use such as yours may well take less time. 15x use is a fledgling addiction and will be easier to shake than an addiction and subsequent tolerance build fo someone that's used for many months or years. Still, it's something you may want to avoid stopping dead. If you're experiencing withdrawal symptoms low dose diazepam could help with a reduction over a short period. You can find info on sites like benzo buddies surrounding this in more precise detail. Places liek that will likely be where you'll find the answers you're after. You could also check the bluelight forum. Lots of good info to be found there.
BTW how to I claim my $1 million?
Ready to break my piggy bank in Zimbabwe for you, bring it on !

seriously, thanks. That's reassuring I guess
I did quit cold turkey which led to alarming psychotic episodes when I believed my brain was stuck into madness with reversed thoughts and emotions that I would never come back off so I was pleading my relatives to help me kms cause I was persuaded to be damaged permanently and I would refuse asylum. Shortly after, my brain invented it had a cerebrovascular accident plus simulating physical events (eletrical shock in brain, broken neck placement with invisible blood cloaking on the outside and funny walking)
That's how powerful N withdrawal is. Ofc, I did not tell the medical staff about the kind of abuse. After a brain scanner, basically they put it on an emotional breakdown and gently implied I was loco and should consult. I was released from the hospital gifted with a box of Xanax that I emptied in 1 week (abusing it also, regretfully). A broader mental confusion with negativity lasted for longer
By comparing to Alprazolam, I'd comment N is more efficent / gentle / transparent for sleep but less euphoric, at therapeutic doses at this pace. With repetition, it has a corrosive factor that can irritate the mucosa of the throat
I grew confidence that the blacking out at 200ml would happen without friction over a few seconds of ascending saturation.
Exactly on the cautious side here too. Have been transitioning to a straight edge diet. No nothing for at least a month and still paranoid (not medically insured so can't fail)
Was also stressed of taking Amitryptiline as a substitute for sleep. As a TCA, I imagine it could influence eventually
On air, the waiting can be tough, depending on your mental state. Better be in acceptance of the choice through conscious self-reflection well pondered
Edit: was replying to an answer that was deleted