A drywall installation contractor should be able to install drywall quickly and correctly the first time! It's integral to the process that he or she is able to work fast since often they're paid by the hour. Drywall is relatively easy to install, so he or she should be able to do the job correctly while working quickly.
Even if your drywall installation contractor that is working by the job and not by the hour, remember that most remodeling and renovating projects need to work around certain jobs. A slow contractor can hold up other. A painter or decorator might be idled simply because the drywall isn’t installed in a timely fashion.