True, however I have an educated guess of 12-18 months. Maybe we should we start a poll thread guessing the re-opening date?
Emergency funding & contracts to replace existing infrastructure to a near-original original condition will not require the usual Fed & PA gauntlet of permits and environmental impact reports, as the project is defined as repairs. Once the wreckage is cleared from the NB lanes, the abutments will be inspected, and some design work to replace/re-use the existing bearing points will be performed. The engineering firm on emergency retainer will design modifications to the original drawings as necessary, and permits will be issued in an expedited review. The new bridge components will be bid & fabricated during the permit review, and installation starts as soon as the permit is issued. The inspection, re-design etc. will be 6-9 months upfront while the gaping hole in the highway sits.
The SB lanes will also need to be inspected, a damage assessment made, repairs designed and a budget and repair schedule established. I would think it's the more complicated project. However, the inspection might reveal that limited use is possible with shoring, fewer lanes, and a slower speed limit while the major repair work is in design. Even if only one lane in each direction at 40MPH is realistic, the highway will "reopen" using the SB bridge if at all possible, and as soon as possible. No matter what, I bet the ramp under the highway onto Cottman Ave. is closed until everything is complete.
TLDR: It's gonna be a real mess for a while.