It is now 1.5 years for me without Spotify and Netflix. I was so pissed off by their business practices that I made the same decision ;)
I also revived my mp3 collection from long ago and started buying music from #bandcamp. I have a 10 year gap in my music collection because of Spotify. I don't what to imagine how many albums I could have bought from those 1000€+ that I wasted on the subscription over 10 years.
And for Netflix: fuck them. Their client apps are utter garbage compared to jellyfin, and their business practices are shady at best. I will never pay them again. Disney and consorts are IMO the same.
PS: what I did initially was ask on the jellyfin forums for hardware spec recommendations for my goal. I'm now running a dedicated little NAS that has about 16TB space (4x 4TB because those drives had the best cost-effectiveness when I was buying). More than enough space. But you can also start small with a Raspberry Pi to experiment first. I skipped that step because I was so angry at Netflix and Spotify 🤣
PPS: I recommend #Finamp as an Android jellyfin music client 👌🏽