1. It's worth for money

2. It's not productivity if this product specialize in a certain customers

3. Until when are you off?

4. How long are you planning to stay here?

5. If it's lighter color, the stain would stand out

6. It's winter so there is not much of thin coat sold at shops but I bet when spring comes, there would be more of them sold

Are these natural? If it sounds unnatural or grammatically wrong, please let me know😊r

See a translation

1. "It's worth [it] for [the] money"
2. "it's not [productive] if this product is [designed only for] certain customers:
3. if you are asking about what time someone is off work: "When are you off work?" if you are asking about when someone's vacation ends: "Until when are you off work?" (please let me know if I interpreted this sentence incorrectly)
4. this sentence sounds natural!
5. "If it's [a] lighter color, the stain [will] stand out.
6. "[Since] it's winter, [there are] not [many lightweight coats being sold in shops right now.] I bet when it's spring, there [will be more of them for sale.] ("lightweight" is the term used for thin coats)