Either change it in the appointment/meeting item or change your time scale. Since you failed to post your version, use F1 for Help.

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Milly Staples [MVP - Outlook]
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After furious head scratching, sdinelle asked:
| i am having problem with entering meeting some only last 45 minute
| some last 2 hour and 15 minutes i need to be able to enter it by 15
| minute and not by full hour or half.Eith