You could perhaps combine protonLeah's suggestion with your implied layout ?
Instead of typing "Close" into F4, I4 etc... type in: =Close
At which point F4, I4 etc will populate with the Close Time as specified in the Named cell (eg 21:30)
If you don't want to do that then you need to adapt your aggregation formula (obviously) to account for the fact that some cells are Text rather than Number,e.g.:
Note the Array entry requirement - if the Array has been set correctly the above will appear encased within { } - these can not be typed in manually.
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