The demo or practice account has no limitation whatsoever.

And that's good, otherwise, any limitations would limit your opportunity to practise and get better.

Even if you blow up the account, meaning you lose all the money in it for trading, you can make a new "deposit" and continue trading. Also, you can choose your account balance size, which will provide you with a better experience to mirror a real account and real trading conditions.

If I am not mistaken, the practice account is not limited by time or money. You can use it whenever you want and refill it whenever you want. The practice account has a balance of $10,000 that you can use to trade any of the available instruments on the platform. You can also reset the balance to $10,000 at any time if you want to start over. The practice account is a great way to learn how to use the platform and test your trading strategies without risking your real money. Even you can switch between the practice account and the real account easily with just one click. I hope this answers your question.