No, intraday positions must be squared off on the same day. However, if you wish to hold the stock overnight, you can convert the position to a delivery trade.
If your intraday trade incurs a loss, you are required to bear that loss, which is deducted from your account balance. To minimize loss, traders often set stop-loss orders.
No, intraday trading can only be done during market hours (9:15 AM to 3:30 PM, Monday to Friday). There is no intraday trading available on weekends or outside market hours.