I asked Ibn 'Abbas: How should I say prayer when I am in Mecca, and when I do not pray along with the Imam? He said: Two rak'ahs (of prayer) is the Sunnah of Abu'l-Qasim ﷺ. (Using translation from Muslim 688a)
«رَكْعَتَيْنِ سُنَّةَ أَبِي الْقَاسِمِ ﷺ»