Doing strength training too often every day. Five days a week at most. It is necessary to rest for two days, so that the muscles have time to repair and recover.

Going at 5 pm is suitable for strength (equipment) training, but not for aerobic training. Aerobic training is best arranged in the morning, not in the afternoon. Or go at 8 pm, but don't exceed 10.

However, these two time points are when there are the most people in the gym. If the gym is big and there are many equipment, it's ok, otherwise it's necessary to wait for the equipment.

Generally speaking, it is absolutely enough for strength training to last for two hours without interruption. No matter how long, physical exertion is too large, and the training effect is not good.

Good wishes! ~