Answer: Citrus ripens according to climatic conditions so there's no stead-fast rule in calculating when a particular fruit will be ready to pick. You'll have to harvest an orange and taste it to see if it's ripe. Citrus can remain on the tree for weeks after it's fully ripe, so there's no danger leaving the fruit on the tree until after a few trial and error taste tests. Wish there were an easier way for you to tell for sure!
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