Catherine Anna Manfredi Yronwode
A Pro member should be able to merge any two Public (deceased) profiles.
(It is good to be careful, because only Curators can undo a merge which is erroneous.)
.... unless one member of that merge is not Public *or* is in a "disconnected" branch (one that hasn't been connected yet to the World Family Tree). Only Curators *or* a manager of that "disconnected" profile can 'complete' such merges.
Time does not matter, nor the number of people requesting the merge.
If the manager(s) of the "disconnected" branch are inactive, it would be appropriate to provide the link to such a merge here to ask about it. There are some further checks a curator may take to verify the merge before completing it (particularly checking the status of the managers of such a disconnected branch).