If the anime is going to restart, it will restart after the manga has finished. Otherwise probably never and you'll have to wait for the inevitable reboot 10-15 years down the line.
the anime is supposed to start up again this year as it's been stated that the manga needs at least 10 books out before they are relaunching the anime.
OT: I once heard Kubo signed a contract with Fuji Tv I think a olng while back, It'll return when the manga has really advanced, coz the last episode was from chapter 480, and we're at 573 now, maybe after at least chapter 600...
i hope it to start as soon as possible because this is the arc that should be seen when animated everyone going bankai....... and i want to see ichigo's powers as soon as possible how strong he would be
You are assuming they are still planning to continue the anime and that it's just on hiatus. Even though not impossible, as far as I know as it stands now the series is finished.
If they are planning to air it again or have the intention of continuing someday, it's probably going to take a long time.