I used to attend a life drawing group that had poses shorter than I liked, too. You could ask the group if they'd like to have longer poses or, as my group did, have one class out of every four with a very long pose. They met weekly and the last session of every month would be one long pose for the full three hours (with breaks for the model every twenty minutes, of course). These would be simple seated poses that were easy for him or her to hold.
During the short poses you could concentrate on a detail, just a hand or just an ear, for example, instead of doing lots of five to ten minute sketches of the whole figure.
As for artificial lighting, it's very easy to set up for drawing practice. You're not worried about color temperature so it takes that issue out of the equation. I sometimes put a bunch of objects on the coffee table in the family room while my husband watches TV in the evenings. The only light source is a table lamp off to the side of my "still life," about seven feet away from it and slightly behind me.
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