Effect can vary a lot. I did a tolerance test with 5 mg, and even that was mind blowing. Effect was short, but my executive dysfunction was completely fixed. I cleaned, worked out, did calls and wrote letters I had been putting off for weeks. It felt like a fantastic dopamine shower.
Then, for a long time, I went with 10 - 15 mg. Slowly working up to 50 over 6 months.
The “mind blowing” effect is really fading hard one year later, though. I’m pretty sure that it’s not really what the doctors want. They want regulation of dopamine and noradrenaline in the prefrontal cortex, which is a benefit that does not diminish over time. What gives the amazing feeling is excess dopamine in other regions of the brain, like a recreational drug, and that fades.
Many have been there: How much damage in life is happening between suspecting it’s ADHD and receiving treatment.
What I found most effective is Modafinil, if you happen to live in a place where it’s considered a lower schedule prescription drug and is easily accessible. It’s less safe, so follow doctor’s orders and instructions carefully. Use 1/8th of a pill to check tolerance on day 1.
If you have not built tolerance to caffeine, that is effective for a couple of months as well. Consider guaraná or black tea if you need a lasting effect for many hours.
Another option is if you ever got a prescription of an anti-depressant that works off-label for ADHD as well and have some left over. Many of them take a month to work, but sometimes, the ADHD effect is immediate.
Of course, when you get your real prescription, check if you need to stop the temporary one first! In case of some anti depressants, that can be several days.