I don't know if it would be more than a week -- I would guess that it depends on how long until the investigators are confident that they have got all the data they need and can test their data for various things and don't think there is a hazard for common use of the area at ORD. Hopefully, it won't be too many weeks until they can stop shuttling people on buses between the Rosemont stop and ORD. If it's less than a week, all the better.

On previous occasions where I've had to be shuttled from the CTA stop to ORD -- even from just nearby Rosemont -- on CTA provided replacement buses, the delay has cost me up to twenty minutes. For me that 20 minute difference or even a 10 minute variance could mean a missed flight.