No, domestic flight check-ins are not as long as that, although increased security has made it sensible to get there 2 hours before flight take-off. Baggage reclaim definitely shorter: our family are usually ready for pick-up from Edinburgh airport, baggage and all, half an hour after landing.
Might take longer for non-EU citizens!

Taking our own car over: standard small saloon car, 2 senior citizens was £330 return. (You can get it a bit cheaper if you care to go at unsocial hours!)