This is an accepted solution.
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As specified by Shopify:
Why are these time intervals the only options?
We reviewed how often people completed orders on their own after abandoning a checkout and found that customers are most likely to return and check out after one of these amounts of time, especially 1 hour later or 10 hours later. We chose these times to maximize the number of recovered checkouts for your store.
Despite the warning from Shopify, if you want to send your emails after 48 hours then you should check out these Shopify apps: