I want ot know if there any comment for calculating rebulid time in drawing.
Could you be a little more clear on what you are asking?
Welcome to SolidWorks forums Rajasekaran.
You can achieve this using a rebuild macro with timer. The attached macro will work on active drawing only. You can assign a keyboard shortcut or toolbar button to run the macro.
Read this excellent article on Running Macros without Run button
You might also find this post helpful for your future reference.
Here is a timer
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