
Isaac Zephyr |

It is a standard action to cast the spell, it allows you to use a move action to teleport. Breaking down a turn using it.
"I'm going to cast Walk Through Space as a standard action (possibly casting defensively to avoid an AoO if you're engaged). Now I'm going to use my move action to teleport to space X within 30ft. I still have a swift action."
EDIT: Duration is 1 round/level, meaning each subsequent turn you can continue to teleport as a move action.

Ryze Kuja |

While casting the spell as a Standard Action, you can provoke AoO's. It would last 1 round per caster level (so 14th lvl would be 14 rounds). Once the spell is cast on you, you would be able to teleport as a move action WITHOUT provoking AoO's.
So, Round 1:
SA: Cast Walk Thru Space (possible AoO if you're threatened)
MA: Teleport 30 ft (no AoO)
Round 2:
MA: Teleport 30 ft (no AoO)
SA: Cast a spell
Round 3:
SA: Cast a spell
MA: Teleport 30 ft (no AoO)
So on and so forth for 11 more rounds.