Speaking as an oldster who came to skating late, I would advise you to go for it, follow your dreams, try to make it work, but don't get overwrought if you don't achieve certain goals in a certain timeframe. For as long as you love to do it, do it, and if that ever changes, change what you're doing. Skate for you, not for anyone's preconceived notions of what skaters should do or be.
8-10 hours ice time should be doable - I used to do probably close to 20 hours a week between skating (ice and roller), tennis, dance, fitness, pilates, swimming. Routine is key - I integrated the various activities to fit my work schedule and my travelling, to make maximum use of my time. I would also say you should make sure that you are doing the right things off the ice to make sure your body is in condition to withstand the demands of what you are doing on the ice. Pilates worked well for me, some people do yoga, or ballet, or gym. You may need to compromise. Also proper rest and diet are helpful. Sometimes I found I got stale practising so much and needed a break. Get decent 1-1 coaching so you know you are doing good practice - bad practice is worse than doing nothing. Don't skimp on the basics.
Good luck with uni - hope you get to do some in-person stuff at some point in the year - and make sure you're doing everything you can to recover from the injury and regain fitness.