The regular show will start April 4th, at 25:21 (which actually means April 5th, 1:21am) on TV Asahi. From the description, it sounds like nothing will change from what we've already seen. Yoiko's Hamaguchi and a guest will teach KisuMai things about being in variety shows.
The article did not mention how long the show will be, but as a late night variety show, I'm assuming it'll be around 30 minutes.
Source: Nikkan Sports
Edit: According to Oricon, the show is until 1:51am, so it is 30 minutes.