Answer

Evening Pratikraman should ideally be completed before sunset.

If that is not possible, then it should be done as soon as possible after sunset, with sincere repentance and awareness.

Explanation

In Jain tradition, evening Pratikraman is connected with the end of the day and is meant for reflecting on faults committed during the day through:

• thoughts
• words
• actions

The best time is around sunset time, because after sunset many Jain activities become more restricted, especially due to the principle of non-violence toward subtle living beings.

Spiritual Understanding

The main purpose of Pratikraman is not only timing, but inner purification:

• asking forgiveness
• repenting mistakes
• strengthening self-discipline
• becoming more careful for the future

Takeaway

Try to complete evening Pratikraman before sunset. If missed, do it later rather than skipping it, but with humility and sincerity.