I have a line graph depicting product tests over a 2 week period.

The Y axis are the results ranging from -10 to +10. The X axis is
timescale. The problem I have is that the timescale only allows days,
months and years. What I actually need is the x axis to breakdown into
hours as multiple tests take place each hour.

Is there any way that such can be accomplished in Excel?

Regards
Daz