唔好睇咁耐電視
m4 hou2 tai2 gam3 noi6 din6 si6
Don’t watch television for so long
So longin Cantonese.
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Canto SchoolPronunciation
咁耐
gam3 noi6
so long
Recorded Cantonese
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When to use it
咁耐 describes that much time or such a long duration; it follows the action whose duration you mean.
Examples
唔好意思，要你等咁耐
m4 hou2 ji3 si1 jiu3 nei5 dang2 gam3 noi6
Sorry to keep you waiting so long