how much storage space does an immutable Distro need in the long run?

Two years or so tried fedora Silverblue and one the main issue i run into was storage. I had 180 GB SSD at the time and it filled to 90-something in a week. Now i have a 240 GB SSD and thing of try an immutable distro but worried about the storage space.

Anyone got insight into how big an SSD do i need?