so you're looking at 40k a day ... 200k a week?, sorry but Kona has to be retired due to age, weight and low efficiency.
it's not about time, its more about reducing fatigue over your riding week. and the fact you can enjoy the commute as you'll feel fresher each day.
The quickest and most efficient way to commute is on a road bike that weighs say 8kgs, tubeless ideal, rim brakes or discs (not cable), get your fit right and minimize your carry, (i.e. stash clothes etc at work), no racks, no guards. Pick back streets and bike paths and the momentum you can get on a good roadie is just fantastic, remember you're doing this week after week, hail, rain or shine.
Plenty of options around for $2-3k - you can justify that cause you don't drive and that's at least a few grand a year if you did drive.
a new bike is ideal as you get the warranty and piece of mind that components are new and up to the ks you'll be doing. Do a search on bike exchange for bike options.