Recording a number in a cell every 15 minutes

[pillory]

I am trying to record the contents of a cell every 15 minutes. The cell is linked to an IP address with a constantly moving number and I want to record this number in a cell and then record it again in another cell 15 minutes later and so on for 12 hours. Can anyone help as I am stuck.

[tony h]

Something along the lines of:
This stores a series of values in column E (time now) and F the result from B3
taking the data from B3

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[pillory]

Thats Great thanks for the help