I understand that we can export data matrices to csv or xlsx files.

What about complex objects like lm? For example, in my work I might have a list of length 1000, each with a single lm() object. Each time I load R I have to wait a long time to populate the 1000 length list with these lm objects with a for loop or a lapply.

I would rather just save the list somewhere on my HDD at the end of a session and open it at the start of the next session.