May seem like a basic question

from logic's manual:

• Realtime: Creates the bounce file in real time. Use this setting when you want to bounce audio and instrument tracks, plus external MIDI sound sources that are routed into the Logic Pro Mixer via aux channels.

• Offline: Accelerates the bounce process, depending on the complexity of your arrangement and available system processing power. This setting also allows you to bounce arrangements that would normally exceed the processing power of your system, if trying to play them in real time. Offline bouncing is limited to internal sources (audio or instrument tracks). External MIDI tracks and audio channel inputs are deactivated during offline bounces. The Offline Bounce mode is only available to the output channels of devices that use native audio driver systems (Core Audio). DSP-based audio hardware cannot make use of offline bouncing due to the nature of its stream-oriented technology. (In other words, these devices only work in real time.) Other software applications that are fed into your Logic Pro Mixer via ReWire can be bounced offline.
 
what on earth was all the raw data not calculating the session length stuff about? And why do you say that the summing engine isn't used in offline rendering?

servers? where did they suddenly pop up from...

just generally, wtfayta?