وَأَوَّلُ وَقْتِ الْعَصْرِ إِذَا خَرَجَ وَقْتُ الظُّهْرِ عَلَى الْقَوْلَيْنِ، وَآخِرُ وَقْتِهَا مَا لَمْ تَغْرُبِ الشَّمْسُ
Translation: Asr begins when Dhuhr time has ended under either of the two views, and Asr ends at sunset.
The Dhuhr end-time disagreement carries into Asr's starting time. Both views place Asr's end at sunset.