I can usually turn in a done task, get the reward, and get a new task right away. Has something changed?

>>se
[Adventurer's Guild, Office]
Pushed against the polished mahogany walls are matching leather armchairs separated by gilt-edged end tables. Twirling gently from its chain overhead, the clacking prisms from the crystal chandelier produce a soft melodic chime. Directly beneath the fixture rests an oval shaped desk inlaid with blue lapis lazuli along its edges. Tucked at the back of the room, the dried and well-preserved carcass of a mammoth arachnid rests within a glass display case. You also see Guild Taskmaster Rheteger.
Obvious exits: northwest
>ask rhet about task
Rheteger says, "All done with that assignment? Good job, Guennwhfar!"

[You have earned 875 bounty points, 700 experience points, and 5250 silver.]
>ask rhet about task
Rheteger looks annoyed and says, "I'm kind of busy right now, Guennwhfar. Come back in about 14 minutes if you want another task."<<

What's that about?


"So, what does that green line on the graph represent?"
"Oh, that's the projection of a hypothetical offspring from a union between Sauron and Cruella de Ville; we use that as a baseline for determining character alignment."

What was the task you completed?

There has always been a 15 minute cooldown. The Simustore has guild vouchers to eliminate that wait period. There is a separate cooldown timer for being added to group tasks.