so my experience with Proton centres for my 2018 Persona, from what I can recall.

For my first 1000km service, made an appointment for a Saturday 10:30am and went to WargaCorp Authorized SC at Selayang.
Got there about 10am and got registered. But my car didn't get worked on until about 12.30pm. I couldn't wait around and called for a ride and went home for lunch. I can't remember if they called me inform my car is done, but all I remember is leaving with my car about 3pm. They said their weekend appointments are quite high. Okay so I figured I'll never go to a service centre on a weekend then.

So for my 10,000km / 6 months service, I decided to try at Proton Edar Bukit Maluri in Kepong.
Booked for a Friday 10:00am and was there about 9:30am. I also can't recall much but my car went in to their work area, probably about 11am. By 12 noon still not done, so again called a ride went for lunch and came back. Maybe it was a Friday. Maybe it was additional time spent to check and fix my reported faulty smart headlights. When it was all done left with my car about 4pm. Sigh.

Recently gave Proton Edar Bukit Maluri another go for my 20,000km / 12 months service.
Booked for a Wednesday 10:00am and was there about 9:30am again. Registration done by 10am, saw my car go in about 10:30am. But by 12:30pm still not done. Went for lunch and came back about 2pm. Service advisor my car service was done, just checking and resolving my reported shaking noisy from dashboard. After that was done they gave it a car wash. Finally all complete about 3pm.

While they have been able to service and resolve my issues, and I have no complaints there, but seems like long waiting time is really an issue with any Proton service centre ? Now I just assume my car is going to be in for almost a whole day for any periodic servicing at these Proton SCs.