A few days. . . sheesh.
I finally got around to the French drain this summer. Under the roof's dripline, I dug about two to three feet down, about 18" wide, and continued out about ten feet from the house. I lined the trench with soil separator and used solid pvc pipe under the dripline and perforated pvc in the yard. I filled it all with gravel. Under the dripline, I brought the gravel to the surface to avoid compaction and covered the yard portion with soil.
Last year, I dug down around the foundation about a foot and a half (where the soil was a mess, anyway) and repointed the stone foundation. I also repointed inside the basement. During both of these projects, I continued to slope the grade away from the house. With these improvements, there's no more water coming through the basement walls.
The basement floor is dirt with bricks, so I still have to dig down, put in a vapor barrier, and pour concrete. It's a small basement, but that's a project for another summer.