We covered 15.7 and got all but 3. (Would have been shorter without some of the glitches). So if you're looking at 22 miles, I think you could get those other 3 in 7.
Ballard 2015 was clearable, I think. I covered 18 and got all but 4, which weren't *that* far out.
If I remember correctly, I think the one SS in Puyallup was cleared on foot.