I'm not sure what you are trying, but I would expect:
1) The data in spreadsheet are
2) Select the data and insert a column chart. The columns should all be the correct length, but Excel will choose "nice" fractions of a day (0.2, 0.4, or some such) which are not even hours.
3) Select the vertical axis -> Format -> find the axis scale properties (Min, max, etc.). In the "major unit" field, enter 1:00 (if your version of Excel will accept time entry here) or the number 0.041666666666667 (if your version of Excel will not accept time entry in this field). Observe that 1 hour is 0.041666666666667 (1/24) of a day. You can enter multiples of this number to get 2 hour divisions or 3 hour divisions or whatever major unit you want.
Does that work for you?
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