There's no easy answer to this question since Late Payments can be caused by a number of different factors - ranging from simple cash-flow issues to more serious problems like financial mismanagement.
That said, if your startup is consistently incurring late payments, it could be a cause for concern. Late payments can damage your business's credit score and make it more difficult to obtain financing in the future. Additionally, if vendors or suppliers begin to refuse to do business with you because of late payments, it could severely hamper your ability to operate.
If your startup is having trouble making timely payments, you should take a close look at your financial situation and see if there are any areas where you can cut costs or improve your cash flow. You may also want to consult with a financial advisor to see if there are any other steps you can take to get your finances back on track.