What's the data like? Are you counting instances within a time frame,
summing them, or what?

Is a histogram what you need?

http://peltiertech.com/Excel/Charts/Histograms.html

- Jon
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Jon Peltier, Microsoft Excel MVP
Tutorials and Custom Solutions
Peltier Technical Services, Inc. - http://PeltierTech.com
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"GEM" wrote in message
...
How can I group time on the X axis. For example,

13:00 - 13:30, 13:30 - 14:00, 14:00 - 14:30