Walk into any gym and you'll find people who spend 45 minutes there and people who spend two and a half hours. Who's doing it right?
Probably neither extreme, but the shorter session might be closer.
The honest answer: 45–75 minutes is the sweet spot
For most people doing a standard strength training session, 45 to 75 minutes is the effective range. That's enough time to warm up, complete 15–20 working sets, and cool down without dragging the session out to the point of diminishing returns.
Beyond 75–90 minutes, a few things tend to happen: rest periods get sloppy, focus drops, and the additional sets you're doing are often low quality. More time in the gym doesn't automatically mean more productive training.
What actually determines workout duration
Duration is a downstream result of three things:
- Number of sets. More sets = longer session. A beginner doing a full-body workout with 15 working sets will naturally spend less time than someone doing a 25-set push day.
- Rest periods. This is the biggest variable most people underestimate. Resting 90 seconds between sets vs. 3 minutes makes a 20-set workout 30+ minutes longer. Rest periods should match the intensity of the lift. Heavy compound movements (squat, deadlift, bench) warrant 2–3 minutes; isolation exercises (curls, lateral raises) can be done with 60–90 seconds.
- Transition time. The time spent walking between equipment, adjusting settings, and getting set up. In a busy gym this can add 15–20 minutes to a session invisibly.
Does training longer mean more results?
Not in the way most people assume. Training quality matters more than training duration. An intense, focused 50-minute session will outperform a distracted 90-minute session almost every time.
There's also a recovery consideration. Each set you add to a workout is an additional recovery debt your body has to pay. For beginners especially, shorter sessions done consistently beat marathon sessions done occasionally.
Cardio changes the equation
If you're adding cardio on top of strength training, factor that in separately. A 60-minute lifting session followed by 20 minutes of steady-state cardio is a reasonable 80-minute workout. Trying to do 60 minutes of lifting and 45 minutes of cardio in one session every day is a recipe for overtraining and burnout.
If fat loss is a goal alongside muscle building, consider separate sessions or shorter cardio bouts rather than endlessly extending your gym time.
A practical target for beginners
If you're new to training, aim for 45–60 minutes per session and focus on making those minutes count. Log your sets as you go. It keeps you focused, cuts down dead time between sets, and ensures you're actually hitting your planned volume rather than winging it.
Logging every set is the habit that turns a vague hour in the gym into a productive, measurable session.
When longer sessions make sense
There are legitimate reasons to train longer:
- High-frequency, high-volume programmes (like some powerlifting or bodybuilding splits) genuinely require more sets and therefore more time
- Skill-based training like Olympic weightlifting involves more technique work and warm-up time
- Combined training days where you're working multiple muscle groups that don't overlap
In these cases, 90 minutes is reasonable. Beyond that, question whether the extra time is productive or habitual.