Question about online appointment for changing the visa.

I got an online appointment to submit my documents tomorrow at 1130. But from what I have read in some groups and google reviews, people said it's their breaktime and staffs don't work during that period. And I saw some reviews saying to get to the Division 1 around 0700 in the morning. Am I safe with my online appointment and can go to the office just before 1130 (the given time) or do I still have to get there at 0700 in the morning for a long queue? This is going to be my first time doing visa stuffs in Thailand. I will be so grateful for your tips and suggestions. Thank you so much :))