It is to soon to know and as of now there is no timeline for any repair, if such a thing is even possible at this point. The stop sale is in effect for every Bolt and we now know that even a fresh battery pack that came off the assembly line just last week carries the same fire risk as all the others. GM/LG has no way to tell if any particular cell has both defects so every Bolt has the same random chance to catch fire.
With no way to provide a safe replacement cell/module/pack I am predicting GM and LG legal teams are working around the clock to figure out who pays how much of the cost to buy back all Bolts and discontinue the model, just like the Kona in the Korean market. Then GM will just have to wait until their Ultium powered models hit the showroom floor, and hope buyers have forgotten the Bolt fires by then.
2017 Bolt EV Premier