How much is too much session data?

Hi Paul, I use database sessions since a few years, with MySQL, it's working 100% fine and fast.

I use a mediumblob datatype for the data column and my application saves a lot of data, usually my own objects like business instances (Customers, Orders, Users, etc) and other types of objects like search filters.

My session table has ~4K records right now and its size about 43 MB, looking at phpmyadmin. The blob field usually stays between a few bytes and 16 KB max.