Well, it's great that you are running.

It's the single most important thing you can do as a boxer. Conditioning won't always win you a fight, but it'll definitely make you lose a fight. And by lose a fight I mean by KO or TKO. Because people who give out of energy in boxing get stopped.

However, running for boxing is a little more complicated than just doing LSD (long slow distance). Remember you are running to get better at boxing. Just running 90 minutes a day is better for training to race a 10k.

Here are a few points: (1) Always run for time, never for distance. Just forget trying to figure out how many miles or km you have run. Go by your watch. Don't overcomplicate the running aspect of training. There are so many other things to worry about. (2) Listen to your body. If you are feeling fatigued, you are going to overtrain if you keep running hard everyday. Slow down. Slow down. Slow down. You are running your easy days too fast. Slow down. (3) Remember not to run too much (90 minutes a day). If you run too much, you'll fatigue and it'll affect other parts of your workout. You're a boxer, remember!

So, here is a nuts and bolts program. You need easy days, hard days (long intervals and sprints), hill days, and a long run.

A base building phase of 4-8 weeks:

For the first few weeks, try to build up to where you are running 30 minutes a day. You are building up what the people in your gym refer to as wind (cardiovascular system). Each week do a long run that is double your normal run, i.e. 30 minutes a day then do a long run of 60 minutes. After 8 weeks you should be able to run 30-40 minutes comfortably. Always take 1 day totally off from running a week. It's okay if you have to take 2 days off.

A lactic threshold phase for 4 weeks:

During this period you will add some long intervals where you go pretty fast and feel a bit uncomfortable but you should never go all out. A sample week might be Monday 30 minutes easy, Tuesday 10 minutes warm-up then 4 x 3 minutes fast then 10 minutes cool-down, then Wednesday off, Thursday 30 minutes easy, Friday same as Tuesday but 3 x 4 minutes, Saturday 30 minutes, and Sunday 60 minutes.

Finally you can get really sharp by adding sprints twice a week. Some good workouts are 10 minutes warm-up and 10 x 30 seconds fast with 30 seconds recovery and 10 minutes cool-down. Or you can do 10 minutes warm-up and 9 x 1 minute all out with 1 minute rest with 10 minutes cool-down.

Finally, once that feels good, you can start adding in random sprints into your training runs. Make it unpredictable like a fight. Go fast, go slow, go really fast for 30 seconds, rest for a second, then explode for another 10 seconds, etc. Just have fun with it. You need to train your body to be ready to "go" at any time.

Remember: Get some good shoes. No bro science things like running with ankle weights. No bro science things like jogging in plastics to sweat. Vary running surfaces: grass, pavement, trails, sand if you can find it, etc.
Don't always run with headphones. Never do your speed workouts with headphones. Sometimes you need to know how your body sounds, i.e. know what your breathing sounds like when you are red-lining. This is important info for not punching yourself out in a fight.