Full Node disk space additions without address index and ignoring blocks/index:

Dec 6.1G
Jan 6.4G
Feb 5.8G
Mar 6.4G
Apr 5.8G
May 6.4G

So going on 6.1G a month and a 512GiB drive holds 460GB in disk space (and ignoring anything else there)
and current is 383G, the answer would appear to be 12.6 months - if you let it fill up and didn't care about it failing due to that.

Just hope there's way less transactions due to a lower BTC price, and I guess and it may make it to 2 years?