Depends on what you mean by "fetch". Email is pushed to mailboxes, and then fetched by client applications. The fetch side is entirely up to you - you tell your email client when to get mail from the mail box.
I guess you are talking about the Jira system sending emails though (not fetching) - it does this on events (issue created, updated etc), which is the right time to do it.
But you can also "subscribe" to a filter. Search for what you want to see (e.g. created in the last 24h) then subscribe to it, and Jira will regularly send a list of issues that match the filter at the time you set it up to run. (For example, I often have one scheduled for Monday morning that says "all issues created in the last 60 hours" to catch weekend activity, and another for Tuesday -> Friday for "all created in the last 10 hours")
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