Immigration counters are open 24 hours a day, 7 days a week.

Required documents: To clear immigration at HSIA, you will need to present your passport, visa (if required), and a completed immigration form.

Process: The immigration process at HSIA is relatively straightforward. Upon arrival, you will first need to present your passport and visa (if required) to a immigration officer. The officer will then stamp your passport and ask you a few questions about your travel plans. Once you have cleared immigration, you will be able to collect your luggage and proceed to the baggage claim area.

Arrive early: The immigration lines at HSIA can get long, especially during peak travel times. To avoid long waits, it is advisable to arrive at the airport at least two hours before your flight is scheduled to depart.

Have your documents ready: Make sure you have all of your required documents ready before you approach the immigration counter. This will help to speed up the process.

Be prepared to answer questions: 
The immigration officer may ask you a few questions about your travel plans. Be prepared to answer these questions in a clear and concise manner.

Be polite and respectful: The immigration officers are there to help you. Be polite and respectful to them and they will be more likely to help you quickly and efficiently.