If salaried then it's that you get a yearly figure and then divide it into paychecks of twice a month, the 15th and the 30th. You're expected to get the work done. If that takes 7 hours a day then you can leave after that, but then when there's a project and you have to work late at night and on weekends you don't get paid any more for that and you "must" be there. They may allow you to take work home, to work from home. Sometimes these are administration jobs, but at any rate they're considered line positions rather than staff.
From what I know contract people do some traveling and so it's hard to figure their time waiting in the airport or going by car and stopping for gas and such so they get paid to do a specific job, they also entertain clients and have to keep a timesheet of what they do, and they get a cellphone that belongs to the company, etc.
usually not, the employer normally sets the hours. Some employers allow flex-time.
generally no
