Cloudwatch Evidently Experiment Duration

Hi, i would like to check for Cloudwatch Evidently Experiment, i notice there is a maximum duration of 30 days. Is there special consideration why is fixed to 30 days and if there are alternative means to run experiment for more than 30 days? Using "Launch" instead of "Experiment" would not work as it does not provide useful data like "statistical significance" and "result" (which variation is better).

Thanks.