In the HS5E rules clairsentience examples, le Extra time limitation is not halved (even it's a Constant power); but in Star Hero, psy powers based on Clairsentience have got an halved Extra time limitation.
In the HS Grimoire, Clairsentience spells have'nt got halved Extra time limitation too, even though Extra time is used only to activate them !
Why ? What is the difference ?
The FAQ does'nt tell me more.
Your rules are sometime so complicated to understand.