Source: I will use the "Domestic Daily" tab of BoxOfficeMojo https://www.boxofficemojo.com/release/rl68715265/?ref_=bo_gr_rls. The "Daily" column shows the (domestic) daily gross, and the "Day" column is how I will count the days.

From the same source, "Oppenheimer" grossed >$1 million (domestic) for its first 38 days of release, until it grossed $899,660 on August 28th (Day 39). Thus, this question resolves YES if "Dune: Part Two" grosses >$1 million for each of its first 39 days of release, and NO otherwise. [1]

[1]. Once "Dune: Part Two" first dips below $1M, it is mathematically implausible that it could somehow spend 39 (additional) consecutive days >$1M. Thus, for simplicity, this market resolves based on the first 39 days of release.