Regarding jail time:
2nd DUI in CA is mandatory 96 hours of county jail (supposed to be two contiguous 48 hour periods or one 96 hr period). Many jurisdictions charge 10 days of county jail for a 2nd time DUI.
In L.A. county, defendants usu do about 10 to 20% of jail time ordered (e.g. 20 days county jail, usu def will do 2 to 3 days & will be released due to over-crowding).
L.A. also allows 'private jail' (some cities charge defs to do time in their city jails --safer & more predictable environment --) Defs usu do full time on private jail (10days=10 days). Charge is about 85 per night & jail is booked ahead, so needs reservations; week-end jail is available on this 'private jail', but not with county jail.
If you have questions, the most informed person in court is not the Judge, the atty, or the Prosecutor...it's the bailiff.
Go to court before your appearance date; talk to the bailiff in court (if you can). Ask the bailiff what is the usual sentence for 2nd time DUI in that court & what are your options for serving jail time.
*If you are still on probation for the 1st DUI & that court orders the file (or the offense was from the same court) be aware:most Judges order 30 days jail for a probation violation.
Your experience may be different.