Beard Trim for Australian Summer? What Length Should i Trim it?

Under pressure from my boss (the gf) to trim my beard.
Would be nice to trim it back a little becuase of the hot weather here in QLD Australia that is fast approaching.
What lenght should i trim it to? 20mm? 15mm? 10mm? maybe 4 or 5mm?
Let me know in the comments..
#beard #beardtrimming
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THANK YOU! In advance. YOU are AWESOME!

[@Medomsley]

Would be a shame to cut Rob, it's looking great but if you want a change perhaps go for a long goatee, 4" long or so, that would make it cooler in the summer. But if you take it off keep the moustache, that always looks good on it's own.

[@jamesguirk6290]

6 or 7 is good summer length if you have trimmer that does half mm you can try 6.5 mm

[@Robroscob]

i think my new trimmer does ...ok thanks mate