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Figure 2-3. Uploading the contents of your System Photo Library to iCloud can take hours or days, and can slow your Internet experience to a crawl. For that reason, you’ll want to start this process just before you go to bed. That way (hopefully!) the upload will be finished by the time you wake up.

From

Cover of Photos for Mac and iOS: The Missing Manual

Note

"can take days" - "when you wake up". How many days do you sleep!!