This question is about the Commodore 64 and its graphics chip, the VIC-II.
Imagine that on a particular scanline, the VIC-II needs to fetch 40 bytes (the background tiles) and since it's a badline also it needs to fetch another 40 bytes (the color attributes). That's 80 fetches it needs to make. I know that this steals 40 cycles from the 6510.
Additionally, there are eight sprites, which are three bytes wide each, on that same line, so that's 104 bytes. Actually, the VIC-II must also have worked out that each of those sprites are on this scanline. From what I remember, that's 17 bytes of data for the sprite coordinates. So I think this scenario means the VIC-II has to fetch 121 bytes.
Is that the most a VIC-II will need to fetch in one cycle? If the VIC-II needs to fetch 121 bytes from RAM during one badline, does that mean that it will steal more cycles from the 6510 than the usual 40?