Anything below 6 hours, price is the key.
For example I paid $150 2 ways all in from SIN to NRT 2 weeks ago. No IFE, only b.o.b service available.
31" Seat pitch with recline. Not the most comfortable but not the worst either. SIN-TPE-NRT 1 hour transit at TPE to walk around and stretch.
Personally I do not see the need for IFE. All I need is my headphones and my phone fully loaded with songs and I can sleep throughout the entire journey.
Have booked another flight from SIN-TPE next year March, $120 2 ways all in.
And in case you're wondering, I'm talking about the offspring of SQ, SCOOT.
Flew with them several times and was mostly on time.