The OS itself occupies less than 4GB as an installation image on a USB stick. Installed, it’s somewhat less than that. 10-15GB is probably more than enough room to get a good pilot installation of Linux with typical applications and space to store documents. 60GB is plenty adequate for an actual in-service workstation, unless you have an absolutely huge media collection you want to store.
Thanks for all the advice on SSD size to get for my Linux Mint install. I will look at SSD prices and even though 60GB is enough (thanks for confirming) I will get 120GB if the 120GB price is not much more