Gestation TimeThis chart is really a cheat sheet for me because past the three days it takes for an egg to hatch, I always forget the other numbers. Hopefully, this will help you, too.
Michael Bush's website has some good advice about how to use these numbers to diagnose what is happening in the hive.
How Long Does it Take a Queen to Start Laying?It takes a queen 16 days of gestation time. Add 10 days (on average) to mate, but it could take as few as 3 days or as many as 15.* Then it could take up to another 3 days for her to start laying. If I did the math, I guess this would give a range of 19 - 34 days; however, somewhere around 26 - 28 days is what I've heard from most people.
*Side note: I've been reading Huber's observations lately, and he mentions that if a queen is not permitted to mate until 21 days after emerging, she becomes a drone layer. Thought that was interesting.
Calculating Hive VolumeFor those of us who are math challenged (or who simply want to know the volume of their hives without doing too much work), I thought I'd post links to these online calculators.
This calculator will give you the volume of your trapezoidal hive in whatever measurement you use: http://www.had2know.com/academics/rectangular-trapezoid-trough-volume.html. So if you plug in inches, your result will be in cubic inches. If you plug in centimeters, your output is in cubic centimeters.
Once you know what your cubic measurement is, put that number into the appropriate field on this screen: http://www.lenntech.com/calculators/volume/volume.htm.
Voila! Now you know exactly how many liters your hive holds!