Revelation 13:5 speaks of the beast being given authority for 42 months. Which is, of course, three and a half years - and you might choose to write that as "time, times and half a time" (Rev. 12:14; Dan. 12:7). It might not then surprise you to find reference to three and a half days, somewhere along the line (Rev. 12:9,11).
Just saying, that's all.