The timeout period elapsed prior to completion of the operation or the server

I am getting this error while trying to upload excel sheet in db 

can you please tell me how to avoid this error 

Timeout expired.  The timeout period elapsed prior to completion of the operation or the server is not responding. 

my sql stores procedure requires 8 mins to excute stored procedure

if i try same sp from website then I will get error timeout expored 

can you please help me ..

Thank you 

Sandy