No, that doesn't fall under the all-sorts-of-things that people are free to believe. However, it might be allowable to believe that purgatory is really a temporary stay in hell.
Yes, but in Purgatory you will
get out after X amount of time/prayers/Masses (where X is an unknown/not precisely known number). It's a set method, even it can't be "clocked."
Whereas in Orthodoxy, if I'm understanding FatherHLL correctly, "how" one gets out or even if
any given individual will ever get out is something known even in theory
only to God, so we must pray for all "just in case."
Another example of RC exactitude versus EO broad outlines.