How many days can I stay in Thailand using a visa on arrival?

I was warned last week after recieving my 3rd extension that I would not be getting another one.

You do not need to expect problems if you stay below 180 days per year. Beyond that, you might expect being questioned and/or denied entry when trying to get in.

Until you can't. There's no official limit, it's down to the immigration officer you face at the time

60 days exemption. Extend for 30 days 1900baht. Leave country after 90 days...come back in with another 60 days...wash and repeat. Unlimited air and border runs. As long as your TM 30s reflect moving around the country you will not draw attention from immigration

There is no such thing as a 60 day visa on arrival. Visa on arrival is where you apply for and pay for a visa at the airport, and you receive a 15 day entry stamp.

Visa exempt currently gives 60 days permission to stay, and is not a visa. It's called visa exempt because you are exempt from needing a visa. It is just an entry stamp.

There is no official limit to how many days you can stay in Thailand. But that does not mean it's unlimited. You can do it as many times as they let you. Each and every entry is at the discretion of the immigration officer you are standing in front of. If you do it too many times, or spend too long in Thailand without a long-term visa, you will start to encounter issues. They will pull you out of line and interview you, ask you what you think you are doing, possibly ask to see proof of funds and proof of your ticket out of Thailand. Eventually they will either warn you to get a proper long-term visa or they will just deny entry to you altogether. Most people start to encounter this around 6 months in the country, but it's completely random.