WireIn values

I have this short code to set wireinvalue.
// Set a value on WireIn endpoint 0x00
dev >SetWireInValue(0x00, 0x37);
dev>UpdateWireIns();

Could I check if
1.In normal state, wireinvalue = 0;
2.When wireinvalue is set to 0x37, this value will remained on the wire in for how long?

Thanks