Things get hard around 2, but he definitely can't handle 5. Dick is currently not far behind him and Jason's pretty close to that, both together are too much.
Gender: Male Location: Stuck In the future where Akus evil
Re: Bruce Wayne runs a gauntlet of Robins
it gets hard for him around 4. Red Hood(from the combined might of lost days and under the hood volume 1&2 is really smart a great strategist) while dick has the better H2H. Now once this escalates to 5 he's in trouble. as for 6&7 i strongly believe Bruce has them all beat in if nobody has gear. 8-10 would be slanted in Bruce's favor. so if bruce could manage to get passed 5 he has a shot a clearing this but im sure after 5 he would be pretty beaten up so he still could go down.