The Messenger of Allah ﷺ used to deliver two khutbahs standing, and he would separate them by sitting.  

أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ يَخْطُبُ الْخُطْبَتَيْنِ وَهُوَ قَائِمٌ وَكَانَ يَفْصِلُ بَيْنَهُمَا بِجُلُوسٍ