basically there are 35 chapters that have to be negotiated/achieved to get in. Montenegro has managed to complete 3 chapters so far. That’s 32 chapters to go. If you look at how others have progressed, it will be 10+ years.
Politics or no politics you cannot really speed this up.
Also, they inappropriately/unofficially︀ use the EURO, so paradoxically, they may actually have to stop using it in order︁ to get into the EU lol …