The answer is: 30

Deut 34:8

When Moses passed away, the Israelites entered a phase of deep mourning that lasted thirty days. This significant period can be understood not just as a time of grief, but also as a vital part of their journey toward a new chapter in history. The scriptures note in Deuteronomy 34:8 that "the Israelites mourned for Moses in the plains of Moab thirty days." It underscores how pivotal Moses was to the Israelite community, not just as a leader but also as the one who interceded on their behalf and guided them through the wilderness.

Mourners often embody various traditions when grieving, and we see in other parts of scripture how mourning can signify a time to reflect and pay tribute to a leader's accomplishments. After all, Moses wasn’t merely a prophet; he was a liberator who delivered the Israelites from Egyptian bondage and received the Ten Commandments as a foundational ethical guide for the community.

Interesting trivia: In Jewish tradition, this thirty-day mourning period reflects the ancient practice of observing the following month - marking both respect for the loss and acknowledgment of starting anew. The thirty days symbolize transition, echoing natural cycles of renewal and hope that exists throughout biblical narratives. This theme of moving forward resonates in other prevalent biblical stories, such as the resurrection narratives that embody themes of renewal after death.