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An ioun stone slotted in this manner grants you its normal benefits (as if it were orbiting your head)
The rules for using in ioun stone in a wayfinder are based on the rules for using them normally.
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When a character first acquires a stone, she must hold it and then release it, whereupon it takes up a circling orbit 1d3 feet from her head. Thereafter, a stone must be grasped or netted to separate it from its owner. The owner may voluntarily seize and stow a stone (to keep it safe while she is sleeping, for example), but she loses the benefits of the stone during that time.
The time requirement for taking control of an ioun stone is when you hold it after you first acquire it. How long this takes isn't stated, but for using it in a wayfinder you can just assume you did this when you first acquired the stone. After that, slotting it in a wayfinder is only however long it takes to activate a stowed ioun stone normally (a move action, or a swift action with quick-draw, handy haversack, etc.).
