Yes. If you pay 500 yuan per month, it will take about 800 months, or 66.7 years, to repay the 400,000 yuan debt. The following are detailed instructions:

1. A monthly repayment of 500 yuan means that you can only repay 6,000 yuan per year. Within 4 years, the total *** can only repay 24,000 yuan.

2. Since the debt amount is 400,000 yuan, the monthly repayment of 500 yuan cannot pay off the entire debt in a short period of time.

3. Assuming that the credit card interest rate is 24% annually, the unpaid principal will continue to accrue interest, resulting in a gradual increase in the debt.

4. A longer repayment cycle may result in more interest payments and increase the total repayment amount.

5. A long repayment cycle may put pressure on personal finances, affecting quality of life and future borrowing ability.

6. It is recommended to take measures as early as possible, such as increasing the monthly repayment amount or discussing installment payment options with the bank, to shorten the repayment cycle and reduce interest expenses.

Summary: If you cannot repay the 400,000 yuan in arrears in time with a monthly payment of 500 yuan, it may lead to an extension of the repayment cycle, an increase in interest expenses, and put pressure on personal finances. Further steps are recommended to speed up repayment.