I might have not been clear. 10 seconds to contact with a mage or matrix security.
mundane assets still need the time as stated above.
that's a 3 second after first rond of contact (assuming, somebody spent free action on communicate)
3 seconds to drop into astral
3 seconds to run in astral to place
starting from next ct, combat summoning is a part of the battle.
(might be one CT more to come with summoned spirits already)
for the matrix secuirty guy, this is even faster - CT2, free action to flip into VR, single action to logon if he wasn't already, simple action to jump into nearest turret/security drone.