Conversation max Inbox size

Is there any way to make max inbox size for conversations because alot of users just not leaving them.
Or mb make this feature: for example after 30 days with no activity conversation will be deleted.
@Syndol 25 GBP? I need only function to clean my DB. I dont need another tweaks in this addon. Mb only inbox max size. Why not to implement it in core?
I live in Russia with 1000$ month pay as cardio surgeon and this price a bit high for me ( and 1 option i REALLY need)
But thanks...