Dude, just because he would be solid adamantium doesnt mean he wouldnt tire out, but i guess your making up the rules. Collosus, gets tired it has happend many a time. This was actually his weakness in warriors redemtion. Collossus was sheilding the vegatated magneto from an attack of sentinals. There was a part where he was holding the door together which lead to magneto's room. He was taking on blasts from the sentinals while holding up several ton's of doorway. He tired out and it collapsed on him. If it werent for Exodus Magneto would have been squash, which he already was seeing how Xavier killed his brain. Thats kind of funny..he woul have been squashed squash. 🙂 i made a funny.
No, If Hulk has endless endurance, and unseen strength, then collossus is a short jaunt.