Elvanse is my daily driver, initially started at 30mg and went down to 20, stayed on that for a few years, eventually back up to 30mg where I'm at now.
I have been on it something like 8 years total. And I think 66KG starting weight.
Remember everyone's dosage is different.
You want the medication to be barely perceptable for long-term stability, you don't want to chase any rush you have the first time you use it, as that will just end up being higher and higher doses.