From my experience, no they'll keep on bubbling away forever if you don't create a vacuum level 'break point' where the bubbling can be seen to slow to a crawl.
You need a high enough temperature for the oil to be liquid enough for quick and easy movement of the solvent to the surface, therefore the recommendation of 110-115F.
You need the vacuum level deep enough for quick and easy movement of the solvent to the surface, but if you keep the pump running on and on (-29.9" Hg) the solvent could be purged to a safe and undetectable level, but you're now pulling off mostly just terpenes.
Therefore: 115F, and down to -29.5" Hg in a thin film, until the bubbling slows to a crawl.
Try it on a fresh batch, it doesn't take long to purge butane/propane with this formula. Once the bubbling has slowed to a crawl like escargot, you can check for yourself my assertion, slightly increase the vacuum past -29.5" Hg and the bubbling action will increase.
I personally never take the vacuum level past -29.5" Hg because I think it's highly stressful on terpene rich oils that have a predilection to budder up. Imo, that's why these guys using lower temperature and let the pumps run on and on for days so often end up with yucky budder at the end.
I have no objection to fiddling with temperatures/vacuum levels/duration for artistic purposes, but basic solvent purging retaining the most terpenes possible is simple, and I want that known.