In a large, deep skillet, cook the bacon over moderate heat until crisp, about 8 minutes. Drain the bacon on paper towels. Pour off all but 2 tablespoons of the bacon fat from the skillet. Add 2 tablespoons of the butter and the leeks, celery and thyme. Season with salt and pepper and cook over moderate heat until the leeks are tender, 7 to 8 minutes. Add the wild rice, season with salt and pepper and cook just until warmed through.