Regarding Saitama's durability, it appears the link provided is having some problems; as a result, I suggest we replace it.
'Durability: 'Unknown. At least Multi-Continent level, likely at least Planet level (Was barely even fazed by Boros' attack), possibly far higher Austrian-Man-Meat (talk) 01:13, February 26, 2017 (UTC)
Possible source for training Saitama strength estimate?
An audio book was released in Japan titled "A summer festival with tatsumaki", wherein Tatsumaki says the following
Tatsumaki: That’s also a doll, right? Wait, what? Someone is coming near me! What is that kappa balding thing? AHHH something hit me! What is that? A balding samurai? Hey, what the? Just wait there!
Tatsumaki: Sorry about this, but I’m not going to let you hurt me, so just stay a nice ghost while I just slowly creep by you and…
- uses her psychic powers*
Tatsumaki: Wait, what? WHAT? How come it’s still moving towards me? Why doesn’t my psychic power affect it?
- spooky noises*
Tatsumaki: No…no way…are you a real ghost? What’s the meaning of this?
Saitama: What’s this feeling? It’s as if my clothes are pulling itself tightly around me. Ow! My hair got stuck in it. Ouch! If it keeps on pulling like this my hair roots will—! Just wait a sec. Guess I need to just stand horizontally like this?
Tatsumaki: What happened? Huh? It’s coming towards me! What the hell is that? No I’m leaving! I’m leaving this place!
Saitama: Damn, this hurts. And it’s so dark I can’t see anything. What is going on?
This tells us training(ie, pre-bald but balding(she calls him a kappa so that implies the entire top of his head is bald with a ring of hair, but this could just be a comedic exageration)) Saitama was capable of continuing to move(and, more importantly, surviving) while Tatsumaki attempted to kill him via her psychic powers. These might have been somewhat weakened by fear, however, as it is unclear how fear and uncertainty impact her psychic powers.