What 180 days works out to
"180 days" and "6 months" are close but not the same. Six calendar months span 181 to 184 days depending on the months involved; 180 days is always exactly 180. When a deadline is written as a day count, count the days rather than the months.
Calendar days vs business days
Counting only working days skips every Saturday and Sunday, so the same "180" reaches far deeper into the calendar — roughly 36 weeks instead of 26.
180 business days lands about 72 calendar days later than 180 calendar days — nearly two and a half extra months of elapsed time.
Where a 180-day period usually comes from
- Schengen 90/180 rule. A visa-free visitor may spend at most 90 days inside any rolling 180-day window. The window moves every day, so leaving for a short trip does not reset it.
- IRS presence testing. The Substantial Presence Test uses a 183-day weighted threshold for US tax residency; staying near 180 days in a year is where careful counting starts to matter.
- Half-year policies. Many auto and health insurance terms, product guarantees and probation periods run 180 days rather than "six months."
- School year. Most US states require 180 instructional days, which works out to about 36 weeks of five-day weeks.
Common questions
Is 180 days the same as 6 months?
Not exactly. Six calendar months run from 181 to 184 days depending on which months they cover, while 180 days is always precisely 180. In a contract or visa rule the difference of a few days can matter, so a term written in days should be counted in days.
How many weeks is 180 days?
25 weeks and 5 days, which is just under 26 weeks (180 divided by 7 is 25 remainder 5).
How long is 180 business days?
About 252 calendar days, or roughly 36 weeks, because only Monday to Friday are counted. That is close to eight and a half months of elapsed time, not six.
