i am thinking of gaining ppl but not intrested in aviation as career
will it count toward my CPL ? will it accumulate ?
Yes - it all counts. But if you're only doing 12 hours every 2nd year, you'll have a way to go/quite a while to the CPL - you need 150 hours for that, including 70 PIC.
If you're flying anyway you can re-validate by experience (12 hours in the second year including 1 with an instructor), if not you can do the test.
Remember that all this re-validation stuff is for the Class Rating (SEP), and not the licence itself. That used to be a 5 year renewal cycle for a JAA PPL, but it's now lifetime for the new EASA licence (iirc).