Hello DP, I want to know that if I buy a page rank domain which is recently expired, for how long will the domain maintain its page rank if I does not add content/website to it? And if I add content/website which is not relevant to the domain, then shall I loose the page rank or still maintain? Even if I loose the page rank, then it will still take 3-4 months until google next PR update. Am I right? Please elaborate and write your experience,knowledge here
It will keep its PR until the next time google updates their algorithm. You should really keep it running
Usually, it would lose PR on the next update. However, it domain have backlinks, it would get PR back very soon. PR really depends on the amount of backlinks.