Is anyone here working on their own novel/story (or have you in the past)? If so, how long has it taken you (so far) to develop a working first draft?

As a hobby, I’ve been putting together a speculative fiction story involving a journalist and an airship/aeroplane aviatrix in a world where dark magic and people who wield demigod-like powers over nature exist (or rather used to, according to popular belief).

Anyways, I started running with this idea over two years ago now! I’ve got maybe close to half of it written, but I’m finding it hard to get through the first draft because I have so many ideas I want to use and must filter out the “works for this story” ideas from the “ones that don’t.” I get like an overload of inspiration. I’m also a bit of a perfectionist, very detail-oriented and into researching things to give my story a sense of credibility. Plus, I think it takes a longer time to get done when you’re actually creating your own world. (Mine is very loosely based off of ours during the late 1910s, early 1920s—think WWI-ish—but has rather different countries, people and cultures than ours.)

Does anyone else have a hobby like this (or even a career in writing) and find it difficult to actually get an entire first draft finished? Has anyone taken more than two years to complete a work? I’m an amateaur, and a very determined one, but I know people like J.R.R Tolkien have taken far longer to complete their works (and then get them published), so I guess I’m just curious to know how different people work.