Downtime for applying ECC - HCM Support patch Stacks

Hi,

Can some one advice as how much time it takes to apply ECC 6.0 - HCM system from SPS 18 to SPS 19 .

HR Patch 61 to 65 ..,

Just ball park., We are running in NT/SQL 2008 with Dual Quad CPU -4 AND MEM 32 GB , 4 APPS , CI and DB seperate.

Thanks

Anand