My entry slip into Singapore had a field for the length of my stay. I wrote 35 days, but, after enjoying the country, I want to stay an extra month. As an American-citizen tourist, I can enter Singapore visa-free for up to 90 days.
Are there any consequences of staying longer than the duration I wrote on my entry slip? For example, do I need to take any action to amend my intended duration of stay? Is there a chance of problems at exit immigration or when I enter the country in the future?