"请尽快离开！"

Translation: Please leave as soon as possible!

[HansCastorp]

Not very friendly....

[KX3.]

Not really, that would be without the 请 or even the outright rude 滚开！Besides, it could be a friendly warning from the speaker.

[Michael950770]

Could be telling you to leave a damgerous situation, like a fire

[jim140738]

it's not rude, i think it's just out of context...

[ineedashit]

Rude

[Winston298006]

Rude would be 滚蛋 (literally "roll eggs") or even 你这个傻屄，他妈的给我滚！("Get the hell out of here you stupid c*nt!")

[khyap1]

'Please leave immediately' is not accepted

[lorigkvack]

good.

[chetlin]

"As soon as possible" might not be "immediately", you might not be able to leave for a while still.