Down at the bottom of the Send Screen, you have an option to Send a Survey Blast - this just means that you can send a bulk number of surveys straight away. Click Configure Blast to set this up.
Just enter in the number of emails you want to send and click the Go button. This will look at your customer list and send these based on how many people in your list reach the "Contact Rules criteria".
It can sometimes be good to send a bulk amount of surveys out, but keep in mind these work best when you have time to read and reply to your customers responses. When your customers feel you are listening, they're more likely to continue sharing their feedback with you.
We recommend setting up your system so that you are getting a regular flow of feedback, rather than in short blasts.