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From my experience, it depends on location and environmental factors.The best way to get a fairly good idea is asking people in your microclimate.We have a variety for sale here called "Brooke's late". Supposed to be late season. I found it comes right in the middle of the season, so I know refer to it as "Brooke's On Time". Recently planted a "Zill Late", yet to be seen if it shall be renamed by my farm as "Zill On Time".
This has some good infohttp://tropicalfruitforum.com/index.php?topic=1586.msg21778#msg21778Simon