Posting time is calculated based on number of posts. If you enter 5 as posts per day then after every 288th minute a post will be published on your website. We calculate timining by (1440/number-of-post-per-day). In 24 hours there are 1440 minutes. So your posts schedule will be evenly spread over 24 hours

Credits are valid for 720 hours which is equal to 30 days. After which your credits will expire and all your running websites will be terminated. To continue you will have to recharge and get credits