Minimum duration for Samayik (shravan/householder practice) is 48 minutes, i.e., one muhurta. This is the traditional standard in Jain practice and is considered the ideal fixed period for equanimity, reflection, and non-violence in thought, speech, and action. There are small procedural differences between Digambar and Shwetambar communities, but the 48-minute duration remains the common baseline.

• Digambar: the practice is often described with the Navkarmantra and directed orientation, but still around 48 minutes.
• Shwetambar: similarly observes Samayik for about 48 minutes, with ritual steps that may include Chaitya‑vandana and other customary recitations.

You can read more here and here .

If you want, I can share the core steps or text typically used during a 48-minute Samayik.