Quantity limit for buy or sell order of stock at a time

I want to place 100 quantity of IDBI stock for intraday... But i am facing error in program bexause too many request per time....

How many quantity of IDBI stock i can buy at time.? (50,100,or1000),Considering i will use time.sleep () command after making buy order... So that server will not be loaded with too many request
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