Many gym goers use the time they spend in the gym as an indicator of how succesful their session has been. There’s a lot of science and a lot of bro-science around this subject, but we like to stick with the anecdotal evidence and keep it simple. Train as long as you want to train.
There are a few factors that are going to influence how long you should be spending in the gym, including if you are training with a partner or if you take long rest periods between sets. You could spend 2 hours in the gym if training with mate, using 3-5 minutes rest periods between sets. But if you are training on your own with a high level of concentration, you can successfully complete a workout within 45-60 minutes.
We advise not to overthink this: train until you feel tired and depleted but don’t use that as an excuse to cut your workouts short. Gauge your effort by your ability to complete your desired rep range and how well you can lift a specific weight that you know your previous PB for.
It’s important to find the right balance, push yourself but know when it’s time to pull the pin. Train as long as you need to train, but make sure you are getting the job done. Use rest periods effectively, not as a chance to socialise or check Facebook!