How long should you wait for LOR to come in the mail before sending a reminder?

[Student88]

Granted, it's been a week since I have asked and sent my former prof materials for the letter. My application is due at the end of July and this LOR is the last thing I need to send (hardcopy) by mail to complete my application. 

[daydreamer254]

You're in a very tight time frame...I'd say give it another week before sending your professor a reminder.

[Student88]

Thank you! I sent a reminder and got the letter in time.