If you have multiple browser threads then you can add a date column in database for each account. When some action is finished then you can add 30 minutes to the date now and add it to the database of that particular account. Then add a check condition in the beginning of the thread which checks if the current date is less or greater than the database date. If it is greater that means there is still time left and then close that thread without opening browser.
How to change ip after every load of page in browser
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@mrezair You need to use proxy action every time before page load.
Here is tutorial and video, which explains it in more details
http://wiki.bablosoft.com/doku.php?id=multithreading
http://wiki.bablosoft.com/doku.php?id=how_to_set_proxy
https://www.youtube.com/watch?v=FCfcgDX8ezk