The waiting period is three durations of purity between the menstruation periods, the first of which is when the divorce takes place. The waiting period ends when she begins her third menstrual period after the divorce. It is better that she waits until she finishes the third menstrual period before remarrying.
What has been mentioned on the website is the dislike of wiping the face specifically after Qunoot, not after other various kinds of supplications (du’as). It is recommended to wipe the face after every Du’a, except for the Qunoot as it is disliked. As for wiping the face after the prayer, we are not aware of a narration that encourages or discourages such an act.