MSN doesn't have a custom period feature that you can select when you are on the campaign overview page. You can only choose "Show performance data for": this/last month, yesterday, this/last year and entire time.
The best way to obtain data for a specific time period is to go to reports and choose a keyword performance report as you can select a custom data range. It will show you clicks, impressions, spend, etc, you just have to add them together for total figures.