How it works
Parse each elapsed duration as hours, minutes and optional seconds, sum whole seconds, then normalize into total hours, minutes and seconds.
Input definitions
- One duration per line, H:MM or H:MM:SS
- Plain text; maximum 200,000 characters.
A worked example
- One duration per line, H:MM or H:MM:SS
- 1:30 2:45:30
Assumptions & limits
Elapsed durations, not clock times. Up to 1,000 entries and 1,000,000 hours per entry; whole minutes and seconds must be 0–59. No negative durations, time zones or date arithmetic.
Sources & review
Maintained by AnsRio. Methods and examples use automated checks; this does not imply independent professional certification.
Method updated 2026-10-17. Content checked against the stated method and examples. Our verification approach.
Common questions
Are these clock times or elapsed durations?
Elapsed durations. Hours can exceed 24 and no time zone or date rollover is applied. For example, 26:30 represents 26 hours and 30 minutes.
How does Add hours, minutes and seconds work?
Parse each elapsed duration as hours, minutes and optional seconds, sum whole seconds, then normalize into total hours, minutes and seconds.
What are the limits of Add hours, minutes and seconds?
Elapsed durations, not clock times. Up to 1,000 entries and 1,000,000 hours per entry; whole minutes and seconds must be 0–59. No negative durations, time zones or date arithmetic.