How to pronounce 萬年 in Cantonese (4 out of 6):

不知道幾多萬年啦 應該 probably several ten thousands years I reckon
I don't know how many tens of thousands of years, probably several tens of thousands of years I'm guessing.

Cantonese Sentence Breakdown

不知道 bat1 zi1 dou6
not knowing
幾多 gei2 do1
(slang) how much; how many?
萬年 maan6 nin4
ten thousand years
la5
“now”, with an connotation of doubt
surprise
disapproval
應該 jing1 goi1
should