My Car was done at appx 120k miles total , and had previously been on long life services when new (company car!).
Mine from 80k and run on Shell oils (no fancy Millers nonsense
) oil changes now at appx 5/7k, so at least twice yearly.
A regime of lots of regular long motorway runs, and high power blasts too. Very few short/cold journeys.
Had mine done as a preventative...despite being an engineer, I got garage to do it due to prev mentioned pita! No symptoms of loss of oil pressure, leaks etc.
Nil issues found when sump opened! No fouling at all.
Waste of money? Probably.
Peace of mind, yes.