For someone like a professional session guitarist will they be able to do everything on guitar? I am interested in a job like that so i'm wondering what kind of techniques do they practice daily and for how long each day?
Really good session players are... really good at it. Luke, Andy Timmons, John 5, Steve Cropper, Tommy Tedesco, Glen Campbell to name a few. Dig into their bios to get a feel for their playing habits.
"Your sound is in your hands as much as anything. It's the way you pick, and the way you hold the guitar, more than it is the amp or the guitar you use." -- Stevie Ray Vaughan

"Anybody can play. The note is only 20 percent. The attitude of the motherfucker who plays it is 80 percent." -- Miles Davis

Guthrie on tone: https://www.youtube.com/watch?v=zmohdG9lLqY
Most session players don't actually practice technique, not the ones i know atleast. They have been playing so long that they have reached a level were they don't have to sit down and specifically practice technique. They do however sit down and learn a lot of tunes from different styles, and that helps them adapt to different sessions and keep their technique up.

I mean i know a guy that does session work for a living, he will often get a request to be a session guy for an album and the songwriter will say "i want this part to be very Steve vai-ish" or "i want this part to be in style of New Age pianist like David Nueve, only on guitar". Other times they give him the sheet music of exactly what they want him to play, but often he get's a reference to work from and then he goes home and study a lot of Steve vai and David Nueve pieces until he can craft something similar.

So it's basically a lot of being a a jack of all trades.
Fusion and jazz musician, a fan of most music.

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I don't think anyone can know "all" technique. There are too many obscure styles and such. Some require years of study for proficiency... Like Flamenco.

However, studio guys (at least the good ones) are very versatile. I used to read the late Tommy Tedesco's column in Guitar Player magazine. He was a prominent LA area studio musician. He used to have a cartage company haul a huge pile of instruments to each gig....And he could play 'em all.
But even he admitted that if they needed some special style, they'd bring in a specialist.
You can be a professional in a lot of different, specialized capacities. Some people are outstanding country players and stick to that style, some do jazz, etc. Some people are generalists and can do every style, but not with virtuosity. And some are just plain freaks who can play anything they want at a very high level.

I think with session players you hire the person for the sound you want. If you're laying down a bunch of country tracks, there's no need to get someone who can shred sweep arpeggios. But if you're putting together something eclectic, maybe you want someone with a versatility more than authenticity.

What it comes down to is that your skill isn't measured by how many things you can do, but how well you do can do them. It takes a lot of practice and experience to get good at a one or two styles, let alone become a universally talented player.
^ That's what I'd have thought (though admittedly I have zero experience with session playing ).
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You'll want to be able to make up chord progressions and licks to fit songs too, I think session musicians focus on the musician part of it a lot more than the guitar playing part of it.