Web spinners can create sheets of sticky webbing up to three times their size. They usually position these sheets to snare flying creatures but can also try to trap prey on the ground. Approaching creatures must succeed on a DC 20 Perception check to notice a web; otherwise they stumble into it and become trapped as though by a successful web attack. Attempts to escape or burst the webbing gain a +5 bonus if the trapped creature has something to walk on or grab while pulling free. Each 5-foot-square section of web has a number of hit points equal to the Hit Dice of the creature that created it and DR 5/—.
What is "three times their size"? I'm looking at giant spider. So, since a medium-sized creature occupies a 5 ft. square, 5 ft. square × 3? An area of 15 ft.?
[I]n combat I can deploy a giant spider to spin web traps.
Web is probably a standard action:
Those extraordinary abilities that are actions are usually standard actions [...].
So, can a giant spider create a 15 ft. area sheet of sticky webbing as a standard action?