Why three years?
Money. I can sink about 10 grand a year into it.
I was completely debt free before buying the house and would like to stay debt free except for the mortgage so I'm doing everything out of pocket.
I'd do a home equity loan but I only had 5% down, so I don't have enough equity. I want to keep at least enough money in my savings account to stay afloat for a few months if I would lose my job or something.
I have a few grand to get me started. The first thing on the agenda is to pull all the interior trim in the bedrooms and smooth out the drywall.
I thought all the drywall seams were bulging, but it turns out they are all low and were just never finished properly.

Hopefully I can have it done in a few months (I'm working long hours so don't have the chance to really knock it out quickly). I'm taking it one wall/ceiling at a time.
After the drywall is cleaned up, I'll paint, add ceiling lights to the bedrooms, have the hardwood floors refinished, then replace all the trim and interior doors with modern stuff. Also going to replace all the outlets for good measure. The bedrooms should look like new construction at that point. That was the plan anyway. The hitch in it is that the hardwood floors are continuous throughout the house so should really all be done at once. That means I'll also have to do the drywall in the living room first. It wouldn't be that bad except that the ceiling has tiles glued to it. I haven't pulled any off yet, but I think they're glued directly to the drywall and it will be a PITA to get the ceiling looking nice after ripping them off.
I hope to get that and the bathroom done this year. The bathroom needs gutted including ceiling and subfloor. The whole house will get replumbed when the bathroom is done, but it's a small one bathroom house and everything is easily accessible from the basement, so I don't think it will be that bad. The bathroom probably should also be done before having the hardwood floors refinished. I could probably do the floors myself, but it's one of the things I've decided that the cost of a professional getting it done quickly is worth it vs me getting it done slowly.
The kitchen can be sealed off from the rest of the house, so it can wait until another time.
I'm hoping next year, but threw in an extra year just in case.
If that gets done the second year, I'll probably be working on the exterior in year 3.