Afternoon, I am trying to work out from a data set how long a particular type of work has been running. I have start and end times, and can create a key field, but my problem is the data is being produced over multiple years, 24 hours a day. So looking for how to group I am struggling. At the change of any item in Orange, I need to group by and subtract the min start time from max end time. However, this data is repeated several times within the table and crosses days, so I cannot add a date into a key. If there is a gap I need to count as separate. Trying to do this in powerquery.