Hi Harish,
I am not sure I understand what your InfoPath form looks like.
If each form just has a single task, start date, name, description, date, hours, etc. ... and no repeating table or section. You can just promote the fields to SharePoint (in the InfoPath Designer go to Tools->Form Options->Promoted Properties). Publish the XSN to SharePoint form library. You'll have to open and resave all previously submitted XML. Then, in SharePoint form library, create a new view using data grid. From the data grid, you can export to Excel and use Excel pivot tables to get the questions you want answered. You can also customize your forms library (using grouping, sorting and filtering), but you can't easily do pivoting within SharePoint.
If each form has multiple tasks and hours, you will have to save your data to a relational database and extract the data into Excel using database queries. Best practice here is to use a Web service between the form and SQL database. We have a free trial of a generic Web service available that does this. Search for DBXL. Of course, you can also use Excel Web Services to create a dashboard of the data on the web site.
I think the key thing is to make sure your InfoPath form is getting published to a SharePoint form library first.
Good luck!