There are unfortunately still very few specialists who are able to diagnose ASD in adults, so 2-3 years is unfortunately a realistic estimate.
If you have the money to spend, you can reduce this wait time to around 2-6 months by looking for a practice offering privately paid ASD diagnostics (Selbstzahler). It can cost anywhere between 450-900€. It‘s pretty ridiculous that you can only get a somewhat timely diagnosis by paying for it yourself, but it‘s really a supply/demand issue.
Importantly, if you decide to go that route, make absolutely sure that you‘re actually talking to a qualified professional (someone who has an Approbation). There are quite a lot of shady life coaches and counselors trying to make money with ASD „diagnoses“ which have no medical or legal significance.
Best of luck to you, hope you‘re able to get answers soon!
It‘s the default for Youtube, Netflix and most video conferencing software like Webex, if you‘re using somewhat up-to-date hardware. So I‘d say it‘s commonly used by now.