Upgrade from 5.02 to newest version

Situation
We need to upgrade from 5.02 to the newest version. Any idea how long this might take or how involved it may be? Also, will the upgrade break any current APIs or configurations?

OpenEMR Version
I’m using OpenEMR version 5.02

Browser:
I’m using:

Operating System
I’m using:

Search
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Logs
Did you check the logs?
Was there anything pertinent in them?
Please paste them here (surround with three backticks (```) for readability.
You can also turn on User Debugging under Administration->Globals->Logging User Debugging Options=>All