There is no fixed frame to define this. It totally depends on the features required and version planning. Its advisable to share the story-board of proposed mobile app to a professional android development company. Ut can review all the aspects and let you know the estimated timeframe.
how long does it take to build a asimo
The average is 6-9 business days. (Monday to Friday)
how long did it take to build the half moon
how long did it take to build the scottish parliment?
how long did it take to build cabot tower
Before building but after initializing the repository android 4.1 is using 13.2 GB. After the build, android 4.1 source + build requires at least 30 GB of free drive space according to the android.com help files.
hs2 will take 15 years to build
how long does it take to build a beam bridge of 2400 sq ft
it took 3 years
How long did it take to build st James cathedral london
a long time
how long did it take to build seaworld in sandiego