It has been a while since I last used my Priority Pass card and hence the best time to use it is when I fly Economy. Priority Pass has quite an extensive lounge list one can go in Suvarnabhumi Airport (although most of it is Miracle First and Business Class Lounge). As I was short on time, I just chose the lounge nearest to my departure point in Concourse E which is the Oman Air Business Class Lounge.
That Time Of The Year! 