How long after copulation can a female still produce fertile eggs? Does the time length differ between species?
Cheers Will. I'll have a read. Your 2nd link doesn't show anything.I think the first record of this ...
http://www.jstor.org/stable/1437776?seq=1#page_scan_tab_contents
Saying it's sperm storage...
http://s3.amazonaws.com/academia.edu.documents/42053554/Oviductal_sperm_storage_as_a_reproductiv20160204-27521-20nptm.pdf?AWSAccessKeyId=AKIAIWOWYYGZ2Y53UL3A&Expires=1494635291&Signature=t0ahK7AeAOqzJPqXGOwdkEE8Mgo=&response-content-disposition=inline; filename=Oviductal_sperm_storage_as_a_reproductiv.pdf
Directly to answer your question there are many factors that influence the length of time which sperm may still be capable of fertilization. There are a few accounts of multiple paternity in turtles and tortoises which sorta indicates there is no sperm competition.