Permit to purchase land

Has anyone here gone through the process of getting permission to purchase land (zezwolenie na nabycia nieruchomości) and can describe what it entails? I've read the official version but am getting wildly varying information on how long it takes (between 2 months (Polish gov site) to 3 months (financial advisor) to 1 year (notary)).

Apparently now that I'm not longer an EU citizen (Brexit) I can't just buy land any more (the place I'm interested in is pełna właśność.) until I've had permanent residence for five years. This despite the fact that I'm covered by the withdrawal agreement, which states that UK citizens should get equal treatment as EU citizens...

From my research it's going to take about 6 months if you have all the documents ready. 1 year sounds too pessimistic (a notary can do the job within the 6-month time frame). Euro is pretty much the same as UK.