I just wonder why you are doing all these check-flights, is it a currency requirement of the place you hire the aircraft?
It would have been far easier if you had done a few 1+ hour flights to a distant airfield then return after tea and cakes.
In many Gliding Clubs, they can ask for 2 week currency, just to give their Basic Instructors some free airtime. Whether this is ethical or not is open to discussion.
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