The best time frames to focus on might be shorter studies, somewhere along the lines of 30 second to 1 minute. Shorter studies might be able to help you get used to just describing the shape of the figure instead of worrying about adding detail, which is a good way to familiarize yourself with human anatomy and gesture drawing. You might also want to try making a base for your figure - a few lines, a few shapes - and then building off of that, rather than just trying to draw everything all at once. Starting simple does wonders for beginners!
Class mode is a pretty good way to get into a habit of drawing and a routine, and it's good for keeping track of the time you're drawing every day. I've also found that it's good for keeping me on track so I'm not constantly pausing poses I like and skipping ones I don't. How useful it is might depend on your preferences, though, as well as what you're actually looking to invest your time in. I would personally recommend trying it out and seeing if you like it more than equal-length poses.
The most important part of learning to draw, though, is spending time on it! The more time you invest, the better. As long as you push through and keep practicing, you'll improve! Kudos on beginning the journey, and happy drawing
