i would also think is it realy necessary for the work to be completed on one weekend some electricians might feel they need to charge more to get the job done in that time period others may prefere it as they can then move on to other jobs.
as a customer i would prefer someone that would take a bit more time and think about the layout of each room a bit more and discuss options while the job is in progress.
also remember if it is a blank canvas where kitchen units, beds going tv points etc, nothing worse than having a rwire then having to put in extention leads to charge your tablet while on sofa