Further surveys showed if you didn't receive a reply from someone you sent an email to within 24 hours, assume they aren't interested. (datingadvice.com)
Do not limit to just one or two people because you may not receive all replies from people you contact. (afreedating.com)
Try sending an email across; if you don't receive a reply within a week that can be a good indicator of the sites true nature. (blog.behappy2day.com)