How much USDT can I buy?

Could you please elaborate on the factors that influence the amount of USDT I can purchase? Is it solely determined by the amount of funds I have available in my account, or are there other considerations like market conditions and exchange rates? Also, how do I go about the process of purchasing USDT? Is it a straightforward transaction, or do I need to follow specific steps or provide additional information? Lastly, are there any limits or restrictions on the amount of USDT I can buy at a given time? Thank you for your clarification.