How long should the Lions sit Matthew Stafford?

The Detroit Lions lost yesterday in Chicago against the Bears 20-13 without franchise quarterback Matthew Stafford.

Early last week, he came up on the team’s injury report listed as ‘limited’ during practice with a back/hip injury. Eventually reports surfaced that Stafford had broken bones in his back and wasn’t cleared to play by Detroit’s medical staff.

Jeff Driskel started for the Lions in his place and looked like a backup quarterback. With the team sitting at 3-5-1 on the season now, how long should the Lions let Stafford sit?