My presentation will take about twenty minutes.
我的报告大约需要20分钟。
My presentation will take only 10 minutes of your time.
我的报告只需要占用大家10分钟的时间。
My presentation will take about 15 minutes.
我的报告大约需要15分钟。
My presentation will take about one hour, but there will be a ten-minute break in the middle.
我的报告大约需要一个小时的时间，不过中间会有一次10分钟的休息。
Refreshments will be provided for you during the break.
休息期间有茶点供应。