Extremely long sync with some DBs (e.g. BU)

[serbinsh]

Pretty sire I have raised this before but when our DB has gone done for a period of time and I re-enable the sync, syncing with BU takes / can take a very long time (hours). Even during the course of normal operation and syncing it sometimes doesnt finish before my next sync cron job starts.

Does anyone have any suggestions on how they are managing to keep their DBs synced but avoiding jobs not completing before the next? Should I create a separate sync with BU that runs slower than say with WI and UIUC?

Feedback requested.