It doesn't even have to be long distance touring, just longer distances around home make it necessary to have a decent frame pump if you want to be self-sufficient in terms of being able to continue a ride if you flat. I gather from recommendations on here that some Topeak minipumps are good for getting to high pressure. That may be right, but the problem still remains about getting to that high pressure. It's still a small barrel, and it will take a heck of a lot of strokes to get there. In my opinion, the only, truly reasonable solution is a full-sized frame pump.

Keep in mind that if you're touring on the kind of tires that require high pressures, you will be able to ride with 60 or so psi, but it won't be the same kind of ride.