Hello and please allow me to offer you a very warm welcome to the What's Best Forum.
To answer your query for myself? It completely depends. If I am working from home, the amount of time I am listening increases dramatically. If not, usually every evening, unless the wife and I have a date or obligation elsewhere. On the weekends, pretty much anytime I am home and not working out in the yard.
My listening sessions have ranged from just a couple of hours to well over 16 to 17. There have been multiple occasions where I will wake up in the listening chair in the very early hours of the morning, only to realize that what I woke up too sounds great, so it's "I'll listen to this song and then head to bed". 2 hours later, I am still listening. Sometimes, I don't even bother going back to bed, depending on what my schedule the following day looks like.
Sometimes, it's just hard to pull yourself away from something that sounds so good.
Tom