Giant Day Geckos

[a628627]

I have a male giant day gecko and I have the opportunity to buy a 2 females that are 5 years old and have laid eggs. I have a few questions on what to do.
How long do giant day geckos live for?
How often do they breed?
Can I keep 1 male and 2 females in a 30 gallon high planted terrarium?

Thanks for all the help.