Downtime required for ECC 6.0 service pack application

Does anyone have any data on the amount of time required to apply service packs to ECC 6.0 when DB2 z/OS is the backend database?
We have done several tests in a sandbox system and the best case we have gotten so far using production LPAR weights is 6.5 hours to go from SP10 to SP11. Our z9 has 158 MSUs.
SAP has also done some benchmarking on a z900 lab machine with >400 MSUs and gotten similar runtimes.
Applying the same service pack to a sandbox on Windows x64 with SQLServer 2005 takes 2.5 hours.
We would like to understand the 2 to 3 times difference in runtimes and improve the DB2 z/OS case.
Brian

Omer,
Thanks for the suggestions. They are not at all out line as I would rather hear something I already know than not hear something I don't even know to check.
To answer:
1) Everything in our landscape uses ficon (DASD and tape)
2) We initially implemented with the SAP directories (sapmnt, usrsap, and trans) on NFS for z/OS. Since we installed ASCS/SCS on USS for z/OS for HA, the filesystems were in HFS and then shared out via NFS to the application servers. Performance was horrible once there got to be more than about 1000 files in a directory, which happens quite often with spool requests and job logs in production ECC. We opened a PMR with IBM z/OS NFS support, and at their suggestion changed from HFS to ZFS, made sure the LPAR which owned the ZFS filesystems was also the LPAR running NFS, etc. We never found a performance silver bullet and testing we did with a zLinux NFS server on the exact same CEC and DASD proved to be 3-4 times faster than NFS on z/OS, so we moved all the SAP files to NFS on zLinux.
3) I don't have exact figures, but the majority of time seems to be spent in the IMPORT_PROPER phase. During our next test cycle I will note the times of the various phases from the import log.
Brian

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