Need specifics reports

Need specifics reports

Hello,
 
My managers wish to have the following information. (SDP Buil 7506 and MS SQL Server)
 
1/ To calculate for every request, the elapsed time between its creation ( Open) and its attribution in a technician, which for us corresponds to the status ( Assigned).

2/ To calculate this average time, over the previous week and the previous month.
 
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3/ To Calculate for every request, the elapsed time between its attribution to a technician, who for us corresponds to the (Assigned) status and its resolution ( Resolved).
 
4 / To Calculate this average time, during the previous week and the previous month by technician.
 
You can indicate to me what are 4 requests to be written.
Thank you in advance

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