Date Timer

[Ralph M]

I have a spread sheet and I would like to have Excel react to certain exents, if column B has 12 entered in say row 16, would I be able to have Excel see that 12, and then if for 60 days there is no more data entered in the column after that, add another 12? 60 rows later? I have a date for each row on my sheet, so I have 365 rows.
Thanks for any help in advance.

 

[Ralph M]

Also, I forgot to ask, if there was some number manually added before the 60 days were up, could it reset the timer to count 60 more days??

 

[Ralph M]

No one has any ideas??