That depends on the application; some might take mere minutes to write, while others can take years. Pilot training systems come to mind, by virtue of the fact that I worked on one that took a team of software engineers some 5 years to develope.
Depending on the complexity and how quickly you respond to us you could have an app built in about a month.
how long does it take to build a asimo
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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
Every app takes different time to load
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
Yes you can delete it and it is gone the moment you hit delete.