You can make as many withdrawals as you like, you just need to make sure you increase your account balance by at least $250 by the end of the calendar month The $250 growth does not include any interest earned.
If you make a withdrawal, (including any interest earned), this will decrease your account balance. To earn the bonus interest, you will need to deposit any amount you withdraw, plus at least another $250 to be eligible for the bonus interest.
For example, if your starting balance is $1,000 and you earn $52 in interest, you’d need to deposit at least $250 by the end of the month to qualify. However, if you withdrew the $52 in interest, your balance would have decreased, so you’d need to deposit $302 (the $52 you withdrew + the $250 growth requirement) to ensure your balance grows by at least $250.