When should I switch from electric tools to air tools?

Hand tools are great for most DIY home improvement projects; however, when your project includes time consuming and difficult tasks, such as shingling a roof, it might be time to switch to more powerful tools. Air tools will help you power through many large projects and thick materials where your physical strength may be insufficient.

How long does it take to compress the air until I can operate the air tool?

This is a difficult question. There are so many factors that can change the lead time. The smaller the tank's capacity, the faster it will fill; the minimum CFM (cubic feet per minute) should be listed on the air compressor. The condition in which you left it also affects fill time. It is good practice to drain the tank at the end of the day to clear out moisture. If you follow this practice, your tank will be empty when you turn the compressor on. The intake is dependent on the air compressor. Generally the lead time should be around two to three minutes, depending on the PSI you need.

Does the air compressor have enough power? Can it provide power on a constant basis?

The PSI determines power. Each air compressor will list the PSI, and it will also say on the air compressor how much power it will sustain.