For Sthānakvāsī Jains, Raisi (Raishi) Pratikaman is the morning pratikraman for faults of the previous night.

Ideal time:

• After sunrise
• Within the first prahar of the day – roughly up to about 3 hours after sunrise

- Example: if sunrise is at 6:00 am, try to complete raisi pratikaman by around 9:00 am.

Better (stricter) practice in many maryādās:

• As early as possible after sunrise
• Preferably before Navkārsi (before taking any food in the morning). ( jainknowledge.com)

If you miss the exact ideal window, do it the same morning as early as you can, with sincere bhāv, rather than skipping.

You can read a simple explanation about pratikraman and its timings here