I"m 70, drive iron regularly
 

have a lot fo muscle, but need to lose 60 lbs. how much biking can I expect to need to do per day or week? Thanks. I'm aware that the main thing is "pushaways" from the dinner table.

Biking is good for cardiovascular workouts and burning calories, but you will have to simultaneously control calorie intake if you want to lose any weight. The problem, especially as we grow older, is doing this while preserving muscle mass, so a variety of complementary workouts will help more. If you can do 100 miles/week and not change your calorie intake, you can start to slowly drop a few pounds per month. If you can sustain that while significantly cutting intake, especially simple sugars, then you can probably drop a lot more.

You would be better off thinking more about how much biking you can realistically do per day or week. Obviously the more you do, the more calories you burn. But you are not going to realistically be able to ride more than maybe an hour or two per day as a beginner - and probably considerably less if you are unfit and overweight.

So I would say just start riding and see how much you can cope with. Along with a sensible diet, you will almost certainly lose weight in the long term.

helps to Include pumping iron i.e.- resistance weight training = more weight loss

https://theconversation.com/resistan...rn%20at%20rest.

I would suggest considering increasing your focus on cardio type exercises. Hard trail hikes, distance jogging/running, rowing (at the gym), treadmill (at the gym), and swapping a portion of your "weight" training with compound-motion floor exercises that'll really get your heart going. Consider high-intensity sequences in some of your training, as well (like Fartlek during running, or HIIT during floor exercises or biking/rowing). If you swim, you might also consider swimming, which, at speed, can consume considerable amounts of calories and provide a fairly whole-body workout.

Here's a guide that can provide a lot of ideas for various exercises to consider for workouts, particularly the gym and "floor" portions of your workouts.

https://darebee.com/filter#sort=posi...=cardio&page=1

The MuscleAndFitness website has a search/filter tool that can show a variety of suggested exercises and workouts. Can filter for type=cardio and difficulty, to narrow in on what might best suit you. Can then pick and choose the specific exercises or routines that might work with your schedule and equipment.

https://www.muscleandfitness.com/workout-routines/

If you want to lose weight, the best way is to consume as much information about proper diet as possible. That new info will cause you to find a way that works best for you.
For me, intermittent fasting and low carb became my best strategy. I lost 160 lbs in 2 years after age 50. I lost approx. 8-12 lbs. per month.

There's no way to say how long it will take you. My best advice is to weigh every day, but don't be too concerned about 5 lbs either way. You can fluctuate that much each day. What you want is to track is the trend over 1-2 weeks whether you are slowly losing weight, staying the same, or even gaining, and adjust what you are doing accordingly.