It is listed under "Questions about Playing in Missions", and makes no mention of downtime.
What about ‘professional services’? Can I pay the decker to find gear for or pay a mage to quicken a spell on my character?
Yes, however the service must be paid for in full before the benefit can be applied. A decker must be reimbursed for the gear AND paid any commission before the gear can be turned over, a mage must be paid the full agreed upon price before expending karma to quicken a spell, etc. As stated previously, the difference in value cannot be more than 5,000¥. (Additionally, see section 8 for notes on Quickening)
Also, even if it was, this does nothing to address how many hits the NPC mage can buy. It really needs a hard formula, like 5,000Y per hit up to 4 hits.