I am new to trading.. I have a few questions about the ordering process

On Ameritrade, I’m not sure if it’s like this everywhere, when I go to sell a stock, it lets me manually enter the share quantity and the price. The price fluctuates every second.. how accurate does it have to be from the time you enter the price to the time you submit your order? For example, when I typed in my share price of 22.22, by the time I moved my mouse over to the submit order button, it had dropped to 22.09. What’s the protocol here?

Also, after I’ve placed my order, it ends up in a kind of pending order status. How long does this last for and what decides how long it stays there?

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