I think one source of the trope that as an academic you have to work insane hours is simply a question of perception. Academics often mix private and work life a lot more than people in other professions. Because they can. And because it fits the type of work. Like a colleague once said, "I don't care about your office working hours, as an academic you also work in the shower when the right inspiration hits. I care about your output.". I always loved the possibility to just take a 2h break in the middle of the day to hit the pool at sunny days and then work a bit more in the evening - or half an hour in the whirl pool.
But that means that many academics also work sometimes at least on the weekend, because that is when they get an idea or because a deadline is close and they work well with deadline motivation or because right then an experiment needs attention etc. So while there are 70hours work people, a good percentage is likely perception.
So from my perspective, in many academic jobs you may need to be more flexible compared to regular 9-5 jobs. I.e. you may need to be fine with deadline crunches, video chats at insane hours with collaborators from the other side of the world, checking your experiments on the weekend etc. Then again, it's a field where you also can be more flexible and just run off in the middle of the day to run some errands.
Academia like, say, game development, attracts a lot of enthusiasts who love their work, but in both branches for most people a healthy life-work balance is important to stay productive. However, 9-5 jobs aren't necessarily providing a healthy life-work balance. The ideal mix can be real individual. However in academics you might find that flexibility often counts more than the overall hours. Work on hard problems when your brain is willing and eager, no matter the time, but also give yourself times to relax in sufficient ways.
That being said, there are also jobs in academia that fit well with a 9-5 job, but they are more rare than if you decide to be - say for example - a car mechanic.
You will in any job compete with over-achievers. With people who put in insane amounts of time (whether that actually helps them to get better results or not) and with people who seem to have not to work at all and still get better results. Don't measure yourself by other people. Measure yourself by your own achievements, how happy you are with your job and with what you earn to support yourself/your family.