How reliable is this quick-fix for my car?

I have a 98 Mercury Tracer, and my vacuum hose connected to the PCV valve tore, so I went to an autoshop and the manager removed the whole hose and valve and put a tube in its place with no valve. he said it was a temporary fix. Now when I crank my car, it idles at about 2000 RPMs and I get a lot of blow by when the car cranks, but the blow by goes away once I shift into drive. How long can this solution last? I cant afford to buy a new vacuum hose/PCV valve, and Im about to move, so I'll have to drive for about 450 miles.. What should I do?