If a person is in detention when the relevant decision is made, all time limits are reduced to 7 working days as set out in Reg 4.10(2) :
[4.10] (2)    However, the period in which an application by a detainee for review of an Part 5 -reviewable decision must be given to the Tribunal:
(a)..
(aa) …
(b)    in any other case — starts when the detainee receives notice of the decision and ends at the end of 7 working days after the day on which the notice is received.
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So for example, say an ordinary spouse visa was refused while the spouse was in detention, instead of the time for lodging an AAT application being 21 days it becomes 7 working days!