How Long is a Halachic Hour

A standard hour (SH) that we normally use is 60 minutes long. A halachic hour (HH) is 1/12 of the time between the start of the day and the end.  On a day where there is an equal length of day and night each halachic hour would be 60 minutes, but it is a different length all other days.  (Berachos 26b)

Question: If a day begins at 6:50am and ends at 7:02pm how long is each HH between 6:50am and 7:02pm?  

Answer: 6:50am to 7:02pm = 12 hours and 12 minutes in SH  

12 hours x 60 minutes = 720 minutes, 720 minutes + 12 minutes = 732 minutes

732 / 12 = 61 minutes per HH.