Puja start times are not universal in Jain practice. They depend on:

• the temple’s local schedule, and
• whether you follow Digambar or Shwetambar customs, and which puja you mean (daily temple puja, Mangala Puja, Navkar Mantra recitation, Pratikraman, etc.).

In general:

• Temple or community puja often begins in the morning after sunrise (roughly around 7:00–9:00 AM, depending on season and location) and again in the evening around sunset (roughly 6:00–8:00 PM).
• Home puja timings are usually based on personal daily routine and local customs; many households start after dawn or after taking the first darshan of the day, with additional sessions in the evening.

For an exact start time, please check your temple’s daily timetable or your home puja calendar. If you share the city/temple or the specific puja you’re asking about, I can give a more precise time.