bulkload は 100 件
fetch は 1,000 件
delete も 100 件程度
> Is there any limit of execution time of scripts? If there is, how long
> is this max execution time for a function?
A few seconds, eight or ten seconds at the most.
> Is there any way to set the max_execution_time or functions like
> set_time_limit() in php?
I don't think so.
> If I want my script to execut in a long time to finish its job, maybe
> 20 mininuts, just looks like a service, is there any way in App
> Engine ?
Nope. Google App Engine is only designed for applications that can
respond to requests in under 300 ms or so.