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Wondering how to properly reaffirm interest in open offers that I have right now. The offers remain open until mid-September, but I have to reaffirm my interest in each by the end of this week. I will have to reaffirm to extend my timeline, because I have a few more CBs this week, then next week will likely be decision time.

What is the proper way to reaffirm interest in an offer? Just email recruiting and say you are reaffirming? Should I explain why I haven't made a decision yet?

Just send a concise email. No big deal. People are still doing callbacks and they know this.