Hello There! The MCU has numerous feats involving the bifrost so I'll be doing one of a few calculations.

The Rainbow Bridge's Durability:

The Rainbow Bridge has channeled and withstood the energy of the bifrost for millennials. According to this calculation from fanverse.com, the bridge would be taking 206.85 Tenatons of TNT per second. Assuming this would be at the very least 2 millennials, now I have to convert it to seconds. Which would be (63,072,022,201 seconds) then multiply the number of TNT by that to get the durability of the bifrost bridge.

According to Omniversal Battlefield Wiki's System of Units, 1 Tenaton of TNT is 4.184e+39 Joules of Energy. After multiplying that by 206.85, we get 8.654604e+41 Joules of Energy (being the energy of the Bifrost endures on the Rainbow Birdge per second).

I used the same Unit System and converted it to Tons of TNT.

That would be 19 TenaMegatons/Trdecilion Tons of TNT. This would make the Bifrost Bridge's durability Solar System Level.

Next Time on JJokster100's Calculations...I will figure out how durable the planet of Jotunheim is with how it took this same bifrost blast. Stay tuned!