Take the skills you are practicing and link them up in sequence.
ICA. Structure and self-discipline are very good for athletes in general. Think like the serious musicians who continue to warm-up on scales and arpeggios throughout their careers.
Most of the good athletes I have known do something along these lines. They create a regular sequence of all the major skills they have previously mastered, and use it as a preliminary warm-up every day they practice. Such a sequence might eventually build up to 15 - 30 minutes. Not only does it re-practice previously learned skills, which is required to keep them good, but it gets your heart and breath rates up, lubricates your joints, and makes you more alert and able to concentrate on new skills afterwards. As your joints become more flexible due to warm-up, deepen your knee bends and edges. After the warm-up sequence, THEN you work on the new skills for this week. (When they are mastered, after a few weeks or months, you append the new skills onto the regular practice routine, without dropping the old ones.) And at the end of your practice, when you are tired, do a regular sequence of stretches - though if your rink is too cold, and you never completely warm up, you may need to stretch off-ice.
Maybe you could ask your coach to help you create a warm-up practice sequence.
I took lessons from a Russian coach, and from his students, who were big on emphasizing certain extended practice sequences of basic edges, progressives, crossovers, and turns in a disciplined fashion, every day. I had a really great whitewater kayak instructor who much did the same thing, with basic stroke and maneuvering sequences, building up in difficulty, but never dropping the basic skills. (You can maybe drop the march and glide type of thing - because you will never use them again. But even basic stroking needs to stay good) I think these things helped their students a lot. For anything approaching mastery (which most of us never achieve, and I certainly won't - but to do as well as we can), it is just as important to practice old skills as new ones. In contrast, when you see someone who manages to get each skill working, then stops working on it, things tend to fall apart after a while.
If that makes any sense to you.
BTW, one odd thing is that when people see me practice those regular, disciplined sequences, they often think I must be a professional coach, and ask about lessons, though I am a long way from being a good figure skater. Maybe because if you practice something a lot, day in and day out, you do get reasonably good at those skills. Maybe because discipline and repetition are so obviously a hallmark of serious athletes.
My personal suggestion would also be that if you do get hungry mid-session, you might be better off eating about 30 minutes before the session, because chewing on and digesting things during the sessions takes away from the energy and attention needed to do other things. But do stay hydrated (drink) throughout the session. Such things vary from person to person, so don't necessarily take my feelings on these matters as optimal for you.
Talking casually to your friends might be better done during end-of-session stretches, or afterwards altogether, because it too steals attention from skills.