I'd have to agree that 90 minutes is a lot of time to spend exercising, especially if you're not used to exercising on a regular basis. You can cut back to 45 or even 30 minutes, on the days where you'll be out and about, doing other things. Save the 90 minute workouts for days when you know you'll have the time. On days where I don't have the time for a longer workout at home, I park a little further from the stores or work, take the stairs, get up from my desk every hour and walk around a bit-- do little things like that to work my muscles a bit more.
Exercise is very important, to get and keep us fit and healthy. Weight loss though is much more about what/ how much we eat. You can't out-exercise a bad diet.
Ruth in Cookeville, TN Central Time Zone
Promise me you'll always remember: You're braver than you believe, and stronger than you seem, and smarter than you think - Christopher Robin to Pooh
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