Statistically, emails get the best results of responses within the first hour they were sent. Every hour after that, the likeliness of a reply drops lower and lower. People receive a lot of emails and they might just simply forget about yours. So what time exactly are you sending out your emails? People are most likely to be checking their email between 8:00am and 9:00am, and then again around 3:00pm.  Sending an email around 5pm is one of the worst times because most people are stuck in traffic and going home to make dinner for their families. They might see your email and get caught up with their home life and forget to respond. Choose the best email time wisely, and get those responses quickly!