With the analogue displays the best way to approach this is to count on the whole hours and make a note if necessary, and then count on the extra minutes, usually in steps of 5 minutes.
With the digital display again work out the hours and then count on. This can be tricky as you may need to stop at the hour before if the minutes on the later time are less than the minutes on the earlier time (sounds complicated but an example would be from 6:55 to 8:20, only count on one whole hour to 7:55).
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