Some time ago I subscribed myself to a few Google Alerts, so typically once a day I get an update on new items it found in various news outfits on the net that match the keywords I asked it to look for.
Usually, because every now and then you get something like this:
Google Alerts <…> Google Alert for: … (10 hours ago)
Google Alerts <…> Google Alert for: … (4 minutes ago)
…
This once a day Google Alert is brought to you by Google.
Emphasis mine, and yes these are two alerts for the same set of keywords. They either can’t keep or they occasionally have very short days. 
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