Hello Guys,
I have a question, Nifty ATM/near ATM options and current month nifty future has the highest number of volumes. If I place an order during trading hours, what would be the best/normal/worst order execution time you have experienced?
Thank You 
It depends on what kind of order you are placing. Market orders are instant and unless you trade big quantities, the impact cost is not more than 1 point. Limit orders, there is not fixed time as such. Sometime it can take longer sometime less, depends on how volatile the market is.
Thanks Nithin