A cycle is counted from the first day of 1 period to the first day of the next period. The average menstrual cycle is 28 days long. Cycles can range anywhere from 21 to 35 days in adults and from 21 to 45 days in young teens.
Report Abuse. 1  How Many Flights Per Day. 2  For the best answers, search on this site https://shorturl.im/awZV0. 3  It would be hard to calculate world figures but i found numbers for the US ranging from 27,319 to 28,537 average flights per day.  That's an interesting question I hope you'll get reasonable 1  answers. Not sure.
Somewhere in the world a Boeing jet is taking off or landing every two seconds â 24 hours a day, seven days a week. Boeing airplanes â 7 series and DC/MD models â have made more than 300 million safe, accident-free flights over the past four decades, including approximately 41,000 safe flights per day, every day, during 1998.