A palace in jannah is 1000 years long http://www.ummah.com/forum/archive/i.../t-195093.html

according to statistics, an athlete person can run 40 miles a day x 365 (a year) x 1000 (years) = 14600000 miles

Thats how big a Palace in jannah is and Allah knows how high it goes.

Thats only according to dunya years and not heavenly ones.