Paushad (also Paushadh/Posadh) timing

• What it is: A one-day-to-mono-strict vow where shravaks/shravikas observe monk-like discipline for a set period.
• When it is done: Commonly on the 8th (Ashtami) and 14th (Chaturdashi) lunar days of each fortnight. Many people also observe it on other auspicious days (new/full moon) or during Paryushan/Das Lakshan, as per local tradition.
• Daily schedule: Usually observed from morning to evening, but some communities (especially in Digambar/Shwetambar variants) may extend to a full day and night or vary with local maryada.

In short: Paushad timing centers on the 8th and 14th lunar days each fortnight, with variations in duration (day only or day and night) depending on tradition. You can read more here