Commercial Package unit replacement is a pretty vanilla process. Either the unit needs to be replaced or repaired. If it does need to be changed out the options available are much more narrow (than residential system replacement) and business owners view it far more transactional.
Once the correct product is chosen the installation process for most 3-15 ton systems take about half a day. This can vary some but as long as everything is in line the process is fairly smooth.
Attached are a few pictures of a recent 4 ton electric 460/3 carrier package unit we replaced in Sugarland tx.