The 48-Hour Work Week Limit Explained (and How Founders Should Think About Hours)

Where the “48 hours” comes from

Many jurisdictions cap the average working week at 48 hours. In the European Union, the Working Time Directive sets a maximum average of 48 hours per week including overtime, usually measured over a reference period of up to four months. Some countries allow individual opt-outs or longer reference periods. Several Canadian provinces, including Ontario, also use 48 hours as a weekly limit, with conditions under which employees may agree in writing to work more.

How averaging works

An average limit means one long week does not by itself break the rule. What matters is the average across the reference period. If you work 56 hours one week and 40 the next, your two-week average is 48.

Use our working hours calculator: enter this week's daily hours, the number of weeks in your reference period, and your average so far. It shows your rolling average against a 48-hour line.

What it means for founders

If you are self-employed, these limits usually protect employees rather than restrict you. But they are a useful benchmark. Long stretches above 48 hours tend to reduce output quality, and if you hire, you must track your team's hours and comply with local rules.

Working smarter in sprints

• Use short, intense sprints — like a 48-hour launch — followed by real recovery.
• Protect sleep during sprints; tired decisions are expensive.
• Automate or outsource repetitive work instead of adding hours.
• Track hours honestly for a month to see where time actually goes.

Keep reading