Short answer: Yes—Pratikraman can be done after 8:15 pm.

Traditional guidance:

• Śvetāmbara: Evening (Devāsī) Pratikraman is to be done after sunset. Many follow a practice of beginning around one muhūrta (about 48 minutes) after sunset. If you miss the ideal window, doing it later the same night is still better than skipping. Avoid starting very late into the night.
• Digambara: Evening Pratikraman/Alochana is also done after sunset; exact clock-time is flexible. The priority is sincere repentance the same night.

Essence: The rule is “after sunset.” Community schedules may vary by city and season. If you can only start at 8:15 pm, do it with full awareness and repentance rather than leaving it undone.

For simple timing guidance:

• When Pratikraman should be done
• Pratikraman basics and types
• Evening Pratikraman timing (practical note)