It does get a little addicting. You are right, the time is in the part collecting. AR's take about 30 minutes to put together, but with the shortage of parts right now it can take a couple of months to find all the bits.
Here are a few of the rifles I have done in the last six months or so:
1942 Remington M1903(M)
1943 Smith-Corona 1903-A3 (started from a barreled receiver)
1918 Springfield 1903 (another barreled receiver resto)
1943 Remington 1903-A3 (no before photos, but it looked like the first rifle)
Another 1943 Remington A3 (started from a bare receiver)
