65daysofstatic (also known by the abbreviations 65dos, 65days, or simply 65) are an instrumental math- or post-rock band from Sheffield, England. The band has thus far released three albums: The Fall of Math, One Time for All Time, and The Destruction of Small Ideas.

The band intersperses heavy, progressive, guitar-driven instrumental sections with live drums and off-beat sampled drums akin to those of Aphex Twin.