Hi , I would like to travel on a bullet train from Shanghai to Hangzhou on 8 August 2015 .

1. To Hangzhou, you can take bullet train from Hongqiao Railway Station, get to Hangzhou Railway Station or East Railway Station. The schedules are from 06:30 to 21:31. And the duration is about an hour.

2. From Hangzhou to SH, the schedules at Hangzhou East Railway Station are from 07:30 to 22:25.
So you can make the round-trip on the same day. :-)

For detailed schedule and ticket fare, you can search them on this website.