It might seem crazy, but the 20-minute pre-title sequence runtime seems to be supported by a piece on the film by VG, a Norwegian site (the film shot scenes in Norway) that quotes No Time To Die producer Michael G. Wilson as also citing a 20-minute pre-title runtime.
If this report is accurate, not only will audiences be waiting quite a while to hear Billie Eilish and see the iconic Bond opening credits, but No Time To Die would sport the longest pre-title sequence of any movie in the franchise.