The Prime Big Deal Days event in 2025 lasts for 48 hours (two days). It starts at 12:01 a.m. PDT on October 7 and ends at 11:59 p.m. PDT on October 8. In Eastern Time, this corresponds to a start at 3 a.m. EST on October 7 and an end at 2:59 p.m. EST on October 8. This sale event offers exclusive deals to Amazon Prime members across various categories during this period.