You're out clothes shopping with your girlfriend. You are waiting while she tries on clothes. She asks if it's OK to try on a few more things. You say:
Sure, take your time.
"Sure" means "yes". But it's more casual. Just answering "yes" to a question can sound as if you are angry.
"Sure" also has some of the meaning of "of course" - meaning that it's obvious and expected for the answer to be "yes". But "of course" is a stronger response than "sure".
To "take your time" means to do something slowly and carefully. You tell someone "Take your time" when you don't want them to think that you are rushing them.
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