He’s fairly high energy, but I generally take him out for an hour - hour and a half every night for a walk. Weekends he gets a bit more and he seems to do well with that kind of schedule. We also have a treadmill and he loves to run on that if the weather isn’t cooperating or we don’t feel like taking him out for one reason or another.
He gets left home every day while my wife and I are at work, no damage, no chewing, etc. That’s generally the easiest way to see if the dog is getting bored or under exercised - they start misbehaving or chewing stuff - especially labs as you’ve mentioned. Our guy is definitely more lab personality than poodle. We’ve met some others more on the poodle side and they can be a bit more nervous or frantic for sure.