At a guess, firstly, once (a) the immediate dangers are over (fire service inspections etc) you have to (b) get in contact with Ethiopians handling agent
to arrange for engineers and a tug. Subject to immediate availability of those resources, I would imagine that (a) + (b) would be 20 minutes minimum.
There would then require to be (c) an engineering inspection to determine what actions if any are required before towing - may be necessary to (d) change wheel(s). (c) + (d) could take a further 5 to 40 minutes - subject to wheel availability.
Then you have the towing clear and final inspection -another 10 minutes. I would imagine a minumum runway closure of 35 minutes, possibly up to an hour depending on extent of problem.
All imho ....