use of Application.ontime

Hello,
This (see below) is an example of the use of Application.OnTime RunTime.
It is supposed the wait for 10 seconds and increment sheet1.cells(1,1).value by 15.
It does not. What am I missing?
Once it works with "00:00:10", I was hoping to replace "00:00:10" by a string that is the result of the concatenation of h:m:s that a user could input. Is this possible? Do I need to add chr$(34) at the beginning and the end? i.e. is aa going to work as is or aa=chr$(34)+aa+chr$(34)?

Please advise

Thank you


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