What drawbacks do manual load tests have?

The manual load testing drawbacks are:

• It is very expensive to do Manual Testing, as real users charge by the hour.
• With manual load testing, load testing for longer durations like for 7 days won’t be possible, as users really work a maximum of eight hours daily.
• You will not get accuracy for results correlation as there are delays between actions of users.
• It is hard to do results collection as the results capture each other.
• It is hard to do.