Hey, more noob questions!, Thanks! Options

[jimbo]

1. Sustaining spell modifier---is Drain dice pool affected? So a magician that normally resists Drain at 11d is sustaining a spell and casts another...so Resists Drain at 9d? Or 11d?

2. A magician is astrally projecting and accompanying friends on a run and combat ensues. Who can the magician target with Mana spells out of the following:
a. Another magician/adept that is astrally perceiving
b. Another magician astrally projecting
c. A dual-natured ghoul
d. A fire spirit

3. Same as above but Physical spell.

4. A magician has a Magic of 4 and -2 Essence from cyberware (so Magic of 2). The magician wants to raise Magic to 3, so is the cost 3 (new value) x5 or 5 (new 'real' value) x5.

5. Ballpark this for me...how long should a probed/hacked admin account go unnoticed if the hacker was not detected on the hack or perceived whilst doing his digging? Hours? Days? Longer?