The time between request and activation can be up to 3 days (most survey projects have 2 to 4 weeks between registration and the first pretest, so that's a lot of time...). Usually, we check all the activation requests at least once a day.
If you've been waiting for more than one day by now, please check if an outgoing message is in your SoSci Survey account -> messages. If not, no request has been sent, yet.