R/3 4.7 Enterprise upgrade to ECC 6.0 EHP4

Just want to ask anyone here who has done the upgrade from r/3 4.7 to ecc 6.0 inclusive of ehp4 - is the upgrade runtime extended/longer compared with the upgrade just to ECC 6.0 SR3 ?
I've personally executed an EHP4 installation using SAPehpi and the end to end time execution is really long and. Some background - we are deciding if we would want to include EHP4 during the 4.7 upgrade or to apply EHP4 separately once the upgrade is done, the downtime is of concern here as we are limited to just the weekend.

Hello Thom,
We did upgrade of R34.7 to ECC 6.0 SR3 EHP3 and we were able to complete this one day downtime. I am not sure about EHP4 but it should not take much longer. I beleive you should be able to accomplish this in weekend.
My suggestion is to do a system copy of PROD to a sandbox and perform test upgrade. By doing this you will know
1. what issues you will have during actual upgrade
2. Tunning that you can do to reduce downtime.
3. SPDD/SPAU adjustments can be evaluated.
By repeating couple of iteration on sandbox. You can estimate what would be your downtime and what you can do to reduce it.
Regards,
Praveen

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