I know there are many constraints regarding this idea, but it should be implemented conditionally!
1. Adjournment should be allow to cuber playing against another who are in friend list.
2.To promote increase in VIP membership ,this should be only facilitated to VIPs.
3.Eventually normal cubers should be also allowed after attaining certain level i.e. level 200
4.Last and the most important, Adjourn option should only work time preference of 20 minutes and more.