Hello,

Thank you for the reply, you are correct for the first time I need to subtract the end and begin time, at each series beginning with 505.
Regarding the PV column, the values of interest always occur within the same range of the 505 series, the one difference is up to 2 instances after the last 505 value is changed to 250, the PV value could still be above 490, so I would need to subtract that date value from the first date value where the PV was greater than 490.

Hope that clears it up.