Metal Mouth Message Board

I am missing one 2nd upper premolar. It is currently held open by a spring, but I am wondering - how long will it take to close it, given all the aggressive measures are taken? The gap is probably about 6mm wide. Thanks!

Took me about a year and a half for my upper premolar gap to close. It was barely visible after a year, but the dentist would use a device to push air to ensure there were no gaps and he kept saying there was a tiny gap. Finally got done in about a year.