Time out Error due to Large data

Hello friends,

I am SAP-ABAPER .

I have one report.There is input screen of date & so.

If I enter 1 to 10 days , then it execure successfuly,

but enter 30 or more days then it gives time out error.

I checked follwoinf things,

1) Query is right as per standards,

2) Not any join condition in that report

3) proper use where clause.

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how I can solve prob.

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Thanks & regards,

Rahul S. Shinde.