the important part was the rail road and that was not destroyed only a change of rails in that section . you think how long it will take ?
also half of the road is intact and military convoys can use that half if an inspection show its safe. also consider the fact that the column are completely intact and only 3 section of the road has fallen into the water , you think how long it take for Russia to build those 3 section of the bridge and then transport them to the damaged site ?
well i said a willing operator can fix it fast , the current record is 43h for a 1300 ton bridge and they had to also build the columns that keep the bridge in place and also destroy the old one
For the trolls who are saying it's "hardly destroyed" there are a few videos doing the rounds showing one carriageway of the road deck under water, the other carriageway looks to have multiple cracks. The rail bridge has been blazing for almost 4 hours now.