1.As such there is no time limit for cash trading(delivery) but for margin trading where you get an exposure of multiple times of your actual cash balance to buy shares you need to square-off well before the session ending. If you buy and sell the shares on the same trading session, then it is an intraday trading, the profit you make is the difference between the sell and buy price minus the brokerage and taxes. The brokerage for the intraday trading is very less. If you need to take the delivery because the share did not reach the price as you expected, then you are liable to make the payment for the whole purchase, if you fail to make the balance payment, the broker may sell the shares and adjust the outstanding.

2. You can trade multiple times, the first leg of the transaction may be charged like 0.01% and subsequent trades may be charged at less rates also. The rates differ from broker to broker, kindly check up with them before doing.

I want to start share trading but have following questions to ask.

1:. is there any time limit i need to specify to sell share at the time of buying

2:. can i buy and sell a particular company's share repeatedly, whenever it fluctuates on that same day. If I buy and sell my share on the same day.how much tax will be levied on that and and what would be the online trading charge on that.