# Calculating time between two timestamps

#### rfinnegan

##### Board Regular
Hi All:

I'm trying to calculate the average transaction time and need some help.
The data is arranged with the transaction number in column A and the time each item in the transaction was scanned in column B (think supermarket scanner).

For example if I had a transaction with 8 items, the transaction number would repeat 8 times in column A, and there would be 8 separate time stamps in Column B.

I need a way to find the difference between the first time stamp and the last for each transaction number. There's about 50K lines of data and each transaction has between 1 and 40 items.

### Excel Facts

Enter current date or time
Ctrl+: enters current time. Ctrl+; enters current date. Use Ctrl+: Ctrl+; Enter for current date & time.

#### DanteAmor

##### Well-known Member
It would be very useful if you explain all the possible cases with examples. In that way we will create a formula that covers all cases.

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