Rule of thumb of how much vacuum does lab glass stand?
The basic rule is that the stress on an evacuated glass vessel is pretty much the same at 0.01 mbar (oil pump), 1 mbar (membrane) or 25 mbar (water jet) absolute internal pressure. 0.99999, 0.999 or 0.975 bar $\Delta p$ to the outside make very little difference if the thing goes pop.

And basically everything made out of borosilicate and with no flat surface is safe. Condensors definitely, they're not delicate at all. It's basic procedure to make them oxygen-free by evacuating.

Be careful with chromatography columns and flasks in the > 1 liter range. They're principally safe to be evacuated, too, but then are also a bomb, armed and ready to drop. If it goes off, you better not stand next to it. The danger from evacuated vessels is more or less proportional to their volume.