Can I delay my prayer by 15-20 minutes if I have a longer Islamic session online, or would it be considered sinful to prioritize the session over performing the prayer at the designated time?
Performing the Prayer on the start of its time is highly recommended as believe from the actions of the Prophet (SAWA) and Ahlul Bayt (AS) that nothing can be more important than performing Salah on the start of its time. Even when they were fighting the enemies of Allah, they never postponed Salah.
'Wassalam.