Hi Anup Kumar Gandra ,
Of course, you can use the last sector as your own user specific data area.
As the smallest erase flash unit is the sector, so you can use the last flash sector.
Just make sure your app code won't touch the last sector.
If you just read the flash, no erase and write, it won't influence the flash cycle. As you know, one complete flash cycle is program+erase.

So, just read, no times limit in the theory!
Kerry
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