I'm afraid you've oversteppped here. Like the power to call elections at any time (prior to 2011) the power to Prorogue can, and has, been used for political ends.
https://researchbriefings.parliament...mmary/CBP-8589
https://researchbriefings.parliament.../LLN-2019-0111
Prior to 1931 it was not unusual for Parliament to be prorogued for more than two months - the last lengthy prorogation NOT before a generation election was 87 days.
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