Related: Flexible work schedule doesn't hurt productivity

Almost 20 percent of employers check the "less than five hours" box. Three-quarters say such distractions as cell phones and the internet chip away at least two hours a day from productive working.

Yet 90 percent of those workers with cell phones in the office — the biggest time suck, according to the bosses — say their phones do not erode their commitment to employment duties.

Related: Focus on work-life balance will drive higher productivity

When asked to name the biggest productivity killers in the workplace, employers prioritized them as follows:

• Cellphone/texting: 55 percent.

• The internet: 41 percent.

• Gossip: 39 percent.

• Social media: 37 percent.

• Co-workers dropping by: 27 percent.

• Smoke breaks or snack breaks: 27 percent.

• Email: 26 percent.

• Meetings: 24 percent.

• Noisy coworkers: 20 percent.

• Sitting in a cubicle: 9 percent.

More results from the survey

The survey also let employers prioritize a list of negative consequences for the organization caused by the above distractions:

• Compromised quality of work: 48 percent.

• Lower morale because other workers have to pick up the slack: 38 percent.

• Negative impact on boss/employee relationship: 28 percent.

• Missed deadlines: 27 percent.

• Loss in revenue: 26 percent.

• Negative impact on client relationships: 20 percent.

What to do about it? While some bosses shrug their shoulders and look the other way, three-quarters say they are fighting back. Among actions taken:

• Blocking certain internet sites: 32 percent.

• Banning personal calls/cellphone use: 26 percent.

• Schedule lunch and break times: 24 percent.

• Monitor emails and internet usage: 19 percent.

• Limit meetings: 17 percent.

• Allow people to telecommute: 14 percent.

• Have an open space layout instead of cubicles: 14 percent.

• Restrict use of speakerphones if not in an office: 13 percent.

• Increase height of cubicle walls to make it easier to concentrate: 8 percent.

While CareerBuilder also asked bosses: What were the most unusual or most memorable things you have caught an employee doing when they should have been working? Among the answers:

• Employee was working on a scrapbook.

• Employee was decorating a cubicle with chains of paper clips.

• Employee brought her equipment for her embroidery business from home and was making items for a craft show to sell.

• Employee was doing doughnuts in the parking lot in the snow.

• Employee brought in a kitten she found outside and tried to keep it quiet within a large purse.

• Employee was working on her child's school project that included uncooked macaroni noodles.

• Employee was laying on a patient's bed talking to the patient while the patient sat in her wheelchair

• Employee was watching YouTube videos of people shoving marshmallows in their mouth.

Anyone got the URL for the marshmallow-shoving video?