What is the bluetooth connection time out in mobile/j2me?

Im developing a 开发者_运维技巧mobile application in j2me.In my application i connect the mobile with some other device with respect to bluetooth.After connection established i send the command from the mobile to that other device to perform some operations via bluetooth. Here i does not know how long bluetooth connection remains.Im using javax.bluetooth package. So please tell me how long (with respect to seconds/minutes,etc) bluetooth connection is remains after connection establishment,Or is there is any bluetooth connection time out in mobile/j2me.H Here im using nokia s40 series is my targetted device in mobile side. Im fresh to bluetooth technology.So please forgive my mistakes in the questions.All of them are welcome to provide their ideas.

Thanks and regards,