First, the $180m was for his six FA years, essentially making it an eight year contract. I was ignoring the arb seasons. In any actual contract, I'd hope the Brewers front-load those arb years to reduce the later years' payroll burden.
How much do you think Burnes is going to make in free agency? And how many years do you think he's going to get?
Gerrit Cole signed a nine year, $324m contract after the 2019 season. That's a $36m AAV and it's now going on three seasons old.
Burnes is going to ask for big money and big years. If the Brewers strike now, six years is a bargain. Come this time next year, a six year extension will be off the table, Burnes will be looking for 7-10.