u/Intelligent-Dark3323

I played the viola as a teenager and recently picked it up again almost 25 years later. I stared taking lessons a couple of months ago and have lessons every two weeks. I've picked it up again fairly quickly which i'm pleased about and i'm around grade 3-4 (abrsm) at the moment, having reached grade 5 pieces as a teenager. Would anyone be able to advise on how long it will take me to progress and get to grade 5 or 6 so I can join a local orchestra? Thanks!