Sooner or later almost every company come across the need to upgrade their SAP systems. There are many reasons for such necessity. One of the most common is end of licensing period of company’s systems. Another one - implementing new functionality that supported in new versions of SAP products. Also maintaining of company’s IT infrastructure that have to support evolving technologies.
Quite impossible to imagine the same upgrade scenario of two different systems, even if they are of the same technical level.
Considering above upgrading of each SAP system requires an individual approach and could last for months.