I often need to ask for things to be returned to me. In a business setting, I have found that giving people a specific date (and sometimes a specific time) helps them. I always follow up with something like, "If you feel you need more time than that, please let me know." or "If this deadline is not feasible, please let me know." Adding that sentence shows the recipient that you are sensitive to his or her schedule. Giving a firm date helps the recipient be cognizant of your schedule.

I have found writing, "when you get a chance" or "as soon as possible" leaves it too much up in the air. And, as the saying goes, if it weren't for the last minute, nothing would ever get done. Your items of business will be pushed back in the recipient's schedule and then you find yourself trying to find a polite way to write, "where's my stuff!?!"

Polite alternatives to "as soon as possible"
Is it possible to achieve an optical mirror coating to a flexible plastic part?

If vacuum metalization is possible, would the reflective coating layer be durable enough to withstand the bending of a flexible plastic such as polyurethane or a thermoplastic elastomer, without cracking over time?
