Time spent on Meetings

Time spent on Meetings

Hi,
I wondered if anyone knew if it is possible to download or find out how long each meeting session lasted apart from just at the end of the meeting as you leave? We need to record this information as the meetings held need to be recorded on a timesheet for audit purposes (Legal case work etc) It would be easier if I could download the data on a weekly or monthly basis rather then remembering to do it after each session. 
Thanks in advance
Emma