Is a TM30 required only at the time of tourist visa extension, or will they check from the day of arrival?

The TM30 registration is only necessary to present at the time of your tourist visa extension at the immigration office. It is important to have the latest TM30 receipt as they typically do not check if you were registered under TM30 from the day of your arrival. Remember, the tourism extension is for an additional 30 days, totaling 90 days after the initial 60-day period.