upgrade Ecc6.0 ehp5 to ECC 6.0 EHP7

Hi Guys,

I need help on below scenario,

we have below setup,

OS : Linux

DB : Oracle (1.5 TB DB size)

system landscape(R3) : ECC6.0 ehp5

we are planning to upgrade Ecc6.0 ehp5 to ECC 6.0 EHP7.

In above scenario,

1. How to start the setup including Steps ?

2. How much time is required for upgrade Ecc6.0 ehp5 to ECC 6.0 EHP7 (How much time/how many days is required)?

3. upgradation steps from Ecc6.0 ehp5 to ECC 6.0 EHP7 ?

Please let me know how much time(Estimation Time) will it take for above system landscape including Dev,QA and Prod ?

Thanks,

Rameessh