Take your time.
慢慢來

No rush/hurry.
不著急

Don't rush into it. /Don't rush into anything.
別草率行事

There's no reason/need to hurry/rush.
沒必要著急

Don't be in such a hurry/rush.
別這么著急

Don't be so impatient.
別這么沒耐心

We have plenty of time.
我們有足夠的時間。

Take it easy.
放輕松

Calm down.
冷靜點

Relax.
放松

No need to rush yourself.
沒必要讓自己太著急

What's the rush/hurry/emergency?
什么事情這么匆忙？/著急？/緊急？

Why are you in such a rush/hurry?
你為什么這么著急？

Why the big hurry?
為什么這么急？

Dialogue1:
A: Don't worry, take your time.
別著急，慢慢來。

B: I'm glad we left early, so we wouldn't have to rush.
很高興我們早早就出門了，這樣就不必著急了。

Dialogue2:
A: Calm down. What's the rush?
冷靜點兒，有什么好著急的？

B: Sorry, I'm just excited.
對不起，我只是太興奮了。

Dialogue3:
A: Take your time deciding. Don't rush into anything.
等等再做決定，別著急。

B: Thanks. I'll be sure and consider everything you mentioned.
謝謝，我一定會考慮你的話。

Dialogue4:
A: Slow down, patience is virtue.
慢點兒，忍耐是一種美德。

B: Yeah, well, silence is golden. Be quiet.
知道了，沉默是金，安靜點兒。

Dialogue5:
A: I'll be done soon.
我一會兒就好了。

B: No hurry. Just let me know when you are finished.
不著急，你結束了告訴我就行。