Make a cell blink by it's entered time plus 2 hours

[clogik]

If I have a time value in cell A1 as 00:00, how can I use VBA to make the cell blink when the current time is 2 hours greater than A1, and stop when cell has no value or empty? Here is the homework I've done. I've never really messed with VBA so forgive my ignorance. Maybe I can use a variation of this, editing the "If Range("A1") = "1" in the code?

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