14 month old rMBP here, I spend all my day with Safari and Firefox open plus Slack and Word/Excel, plus connected to a remote desktop session and I can basicall

14 month old rMBP here, I spend all my day with Safari and Firefox open plus Slack and Word/Excel, plus connected to a remote desktop session and I can basically always expect 3-4 hours under those conditions. If I'm visiting a client and turn off wifi and just take notes in Word, after an 8 hour day I can usually still make it through the evening with some light Netflix.