Do you mean syncing or loading?
Loading for me typically takes around 15 to 30 seconds.
Syncing takes around 8 to 10 min. It's frustrating because my iPhone auto-locks before the syncing is completed.
I've found once the iPhone is rebooted, loading is the longest. Once it has been loaded one time, it loads faster. Especially if i just synced.
I've also wondered if something is going on at mobile me. Last week, for a couple days, syncing was much faster. Now it's slowed back down to 8 to 10 min.
For inbox audio items I use Evernote. Then I process the untagged items in Evernote into OF.
I enter text inbox items into the OF inbox. Once the application is loaded it's fairly quick.