But, do the amount of prayers, whether general or specific or even the absence of specific ones, affect the “time” (if that’s even a word that can be used in conjunction with purgatory) one spends in purgatory?
For instance, if a Protestant dies and is heaven-bound but has no one to pray for him/her because the concept of purgatory is alien to his/her loved ones, are they “in purgatory” until a sufficient amount of general prayers are said? Is there process longer or equivalent to the process a Catholic would have who died with the same imperfections on their soul?
I’m still a little confused

I don’t even know if my questions make sense
Once cleansed those souls in Purgatory go immediately to heaven. They may be cleanses through intercession, which includes indulgences.
Council of Lyons II 1274
We believe that the true Church is holy, Catholic, apostolic, and one, in which is given one holy baptism and true remission of all sins. We believe also in the true resurrection of this flesh, which now we bear, and in eternal life. We believe also that the one author of the New and the Old Testament, of the Law, and of the Prophets and the Apostles is the omnipotent God and Lord. This is the true Catholic Faith, and this in the above mentioned articles the most holy Roman Church holds and teaches. But because of diverse errors introduced by some through ignorance and by others from evil, it (the Church) says and teaches that those who after baptism slip into sin must not be rebaptized, but by true penance attain forgiveness of their sins. Because if they die truly repentant in charity before they have made satisfaction by worthy fruits of penance for (sins) committed and omitted, their souls are cleansed after death by purgatorical or purifying punishments, as Brother John * has explained to us. And to relieve punishments of this kind, the offerings of the living faithful are of advantage to these, namely, the sacrifices of Masses, prayers, alms, and other duties of piety, which have customarily been performed by the faithful for the other faithful according to the regulations of the Church. However, the souls of those who after having received holy baptism have incurred no stain of sin whatever, also those souls who, after contracting the stain of sin, either while remaining in their bodies or being divested of them, have been cleansed, as we have said above, are received immediately into heaven. The souls of those who die in mortal sin or with original sin only, however, immediately descend to hell, yet to be punished with different punishments. The same most holy Roman Church firmly believes and firmly declares that nevertheless on the day of judgment “all” men will be brought together with their bodies “before the tribunal of Christ” “to render an account” of their own deeds [Rom. 14:10 ].
Indulgentarium Doctrina, 1967, Pope Paul VI
- The remission of the temporal punishment due for sins already forgiven insofar as their guilt is concerned has been called specifically “indulgence.”[37]
Norm 2. An indulgence is partial or plenary according as it removes either part or all of the temporal punishment due sin.
Norm 3. Partial as well as plenary indulgences can always be applied to the dead by way of suffrage.
newadvent.org/library/docs_pa06id.htm