Nearly all the time. I have it start on system boot on my phone and my podcasts are downloaded over it. My apps through fdroid are downloaded over it. My Monero wallet is synchronized over it. My chat apps such as SimpleX and Signal are used over it, etc.
Just to get around blocks. Ironically, Tor exits are treated as more trustworthy than my residential IP address.
Mostly when looking for torrents
On desktop, pretty much only when I need to access an Onion site.
I also route my Torrent client through Tor, as neither my router nor my VPN allow port forwarding, but I should be able to seed over Tor without much of an issue (still working out the kinks though).
On mobile, I use Tor Browser as my main browser because it provides the best fingerprinting protection, so I'm stuck using the Tor network as a result.
Tips, tricks and information about the Tor network!