Calculating Repeats not duplicates

I have a report that I have to do that requires me to determine how many times 2nd, 3rd, 4th time someone had to go back to a customer.
Any assistance would be appreciated.
Also, this will be used with a pivot table.
Example:
tech # 1 went to customer acct:969696 1/2/12
tech # 2 went to customer acct:969696 1/5/12
tech # 3 went to customer acct:969696 1/7/12
tech # 4 went to customer acct:969696 1/13/12

tech # 1 went to customer acct:777777 1/2/12
tech # 2 went to customer acct:777777 1/5/12
tech # 3 went to customer acct:777777 1/7/12

I need a formula that will look at this data and say tech #1 had 2 repeats.
I need a formula that will look at this data and say tech #2 had 2 repeats.
I need a formula that will look at this data and say tech #3 had 1 repeats.
I need a formula that will look at this data and say tech #4 had 0 repeats.

I use the date to determine which tech was their first that way you can tell who has been there first.