Millisecond to Month

Under 20 ms feels virtually instant; 20–50 ms is excellent for most games; 50–100 ms is fine for casual play; 100–150 ms causes noticeable delay in fast-paced shooters; above 150 ms is problematic. Fighting games are the most latency-sensitive — competitive Street Fighter players complain about 8 ms differences. Fiber internet typically delivers 5–15 ms within a country; satellite internet (except Starlink) delivers 600+ ms, making real-time gaming impractical.

A single spontaneous blink takes 100–150 ms for the lid to close and open. Voluntary blinks are slightly slower at 200–400 ms. Humans blink 15–20 times per minute, spending about 10% of waking hours with eyes closed — without noticing, because the brain suppresses visual processing during blinks (saccadic suppression). The brain also smoothly fills in the missing visual gap, which is why blinking does not feel like a strobe effect.

The Haas Effect (or precedence effect) means the brain fuses sounds arriving within 30–40 ms of each other into a single perceived sound — the first arrival dominates direction and character. Echoes only become perceptible above ~50 ms. Recording studios use this: adding a delayed copy at 15–20 ms creates a chorus/widening effect without audible echo. Room reflections below 20 ms contribute to the 'liveness' of a space without sounding reverberant.

An ECG (electrocardiogram) records the heart's electrical cycle in ms. A normal PR interval (atrium to ventricle conduction) is 120–200 ms; QRS complex (ventricular depolarisation) is 80–100 ms; QT interval (ventricular depolarisation + repolarisation) is 350–440 ms. Prolonged QT (>500 ms) indicates arrhythmia risk. Cardiologists rely on ms-precision measurement to diagnose conduction disorders, heart blocks, and pre-excitation syndromes.

A ruby-throated hummingbird beats its wings 50–80 times per second, meaning each complete up-down stroke takes 12–20 ms. During courtship dives, the frequency can reach 200 beats/s (5 ms/beat). By comparison, a honeybee beats at 200 Hz (5 ms), a dragonfly at 30 Hz (33 ms), and a large butterfly at 5–12 Hz (83–200 ms). Smaller flying insects generally have higher wing frequencies because smaller wings generate less lift per stroke.

The Roman calendar originally had 10 months (March through December), leaving winter uncounted. January and February were added by King Numa Pompilius around 713 BCE to cover winter. To keep the total at 355 days (a lunar year), February got the leftover days — 28. Julius Caesar's 365-day calendar reform kept February shortest. The "30 days hath September" mnemonic reflects decisions made by Roman senators to honor Augustus and Julius Caesar with 31-day months, robbing days from February.

Four weeks are exactly 28 days. The selected month in this converter is 365/12 days, approximately 30.4167 days, so it is not four weeks. Actual Gregorian calendar months have 28–31 days; February in a common year has exactly four weeks. Use calendar dates when the actual month length matters.

The irregular distribution (JMMJSND = 31 days; AJJN = 30 days; Feb = 28/29) comes from Julius Caesar's calendar reform (45 BCE) and later Augustan adjustments. Caesar gave odd months 31 days and even months 30 (with February 29/30). Augustus then renamed "Sextilis" after himself and extended it to 31 days to match Julius's month — taking a day from February. The resulting pattern has persisted for 2,000 years.

A sidereal month is the time for the Moon to orbit Earth relative to distant stars: 27.32 days. A synodic month is the time between identical lunar phases (new moon to new moon): 29.53 days. The synodic month is longer because Earth moves along its orbit — the Moon must travel further to reach the same phase angle relative to the Sun. Islamic and Hebrew lunar calendars are based on the 29.53-day synodic month.

Yes. The converter defines a month as exactly 2,628,000 seconds and a year as exactly 31,536,000 seconds, so 12 months equal one 365-day year. This is a fixed-duration convention, not a lunar-month average or a calendar calculation that accounts for leap days.