Recite the Qur'an as long as your hearts agree to do so, and when you feel variance between them (between your hearts and tongues), then get up (and leave its recital for the time being). (Using translation from Muslim 2667a)
قَالَ رَسُولُ اللهِ ﷺ «اقْرَءُوا الْقُرْآنَ مَا ائْتَلَفَتْ عَلَيْهِ قُلُوبُكُمْ فَإِذَا اخْتَلَفَتْ فَقُومُوا»