in 15 years of riding my chain broke twice (Road bike). Had to remove the defective link and the avoid extreme gear combinations like Big Ring+Large cog. But otherwise I finished both rides and did not have to push the bike home.
Do yourself a favor... find some old chain and practice using that multi tool a little. On the side of the road with darkness approaching is no time to learn. Use the tool for minor repairs too. You will get used to how the tool works and it's limitations. Better to know that before you need it.