Evening Pratikraman (Devasi Pratikraman) usually takes about 45–60 minutes when done at a normal pace without extra bhakti songs or pravachan.

• Shvetambar tradition: the standard Devasi Pratikraman is often around 48–60 minutes. A shorter “laghu” version can be ~30–40 minutes; on special days (e.g., Paryushan) the full form with explanations can take 1.5–2+ hours.
• Digambar tradition: the evening Sandhyā/Pratikramaṇa with kāyotsarga and prescribed sutras typically takes about 40–60 minutes; expanded observances on special vrats or festivals can run longer.

Actual time varies with:

• pace of sutra recitation and pauses for pratikraman kriyās (alochanā, pratyākhyān, prāyaścitta),
• whether group chanting includes stavans, pravachan, or meanings,
• level (daily/laghu vs full/utsav form).

So, for daily evening practice, plan roughly one hour; expect longer on festival days like Paryushan or Samvatsari.