I was going to make this exact thread but realized I was just being overly sensitive to what parts Kishi skipped.
If you look at the panels, its daylight when he visits the grave, fact. When he actually summons the Kyuubi, its night; fact. Therefore, we have to assume that a full 12 hours or more likely past between those two panels, fact. The only concern that remains after that is why the words, "summoning Jutsu" are shown in the last day panel rather than the first night panel; but this is easily explained. Simply put, its a way to splice two scenes together (most notably in an anime) with words from the next scene being spoken while the last scene is still up.
Now its really hard to explain what I just did, but I tried my best. I think that a lot of people that read this post will understand the kind of anime situation I'm talking about, but again this is really simple. Kishi just outright skipped scenes of events that we have already been informed of and added an anime style flare to that segment.