Ho ho, a modem and a 486. Ladies and gentlemen, we've finally found someone older than me here! But not by much, I DID use some of those, they were just out of date by the time I was old enough to be building/owning any. I THINK the old acer multimedia systems (that I always thought were black, but I guess were dark green??) that had Jazz Jackrabbit pre-installed were 486s, but I could be misremembering.
And fair enough, different things for different people. Third will definitely be more along the lines of the length of 2. Probably a bit larger once all the extras are added in.