"Time to launch is an insignificant metric, especially given the capital costs maglev launcher, R&D for it & worst yet in today's economy the land.

Not. Worth. It."

There are business involved with to getting things places fast.
This could include many things- donor organs being one.
A medicine with a very short nuclear half life measured in a few hours or less being another. Not to mention the super rich who forget their mittens
The fastest you can get anything to Europe would be using supersonic business type jets and nothing currently matches Concorde speed which managed it in about 3.5 hours, so at best it's probably 4 hours or more.

So, with suborbital traveling at 6000 mph [2.7 km/sec] or faster, one can get to Europe in less than an hour. From time the rockets are lit until landing it could be about 30-40 mins.

Say customer is in Chicago, sends package using fast business jet to Virginia, or customer is in Tampa, or Seattle, or LA. So basically Virginia become a destination for anything needed to moved really quickly to Europe from the US and of course everything from Europe or Middle East or Russia to the US. So customer in Chicago may take two hours to ship to Virginia- if and how he shipped to Virginia, will depend on the next flight to Europe from Virginia and it's possible the fastest route could instead be some non-stop flight from Chicago to say Paris.

So, if you flying say 4 flights out of Virginia per day you will probably have a fair amount of cargo if the total amount of time will cut in half of time of any other way of getting there.

A flight from US to Europe could cost less than $1000 and take 8 hours. Lots of people would rather take 10 hours for same trip if it's $800, some people will pay $2000 for it to take 6 hours, very few people would spend $200,000 for it to take 1 hour.
The people who would pay 200,000 for such a ticket generally aren't trying to save time, but it's a matter of tourism- they paying for the experience. But there are a very few people who would pay $200,000 per ticket to save the time and simply for rational economic reasons could be wasting more than $200,000 simply because they are "losing" 6 hours of time.

So, for the space tourist having the trip last 15 mins longer isn't a big deal. They could be easily willing to wait a year to go on the trip and may spend hours traveling from somewhere in order to get the trip.
But there are a few people and a cargo that are willing to pay a huge premium for less time.

Hmm, I got new idea.
*On time* travel insurance.
Which basically insures that you will get where ever you going on time. One could have a very cheap policy, a modest policy, and all the way up to a hideously expensive policy- "whatever the cost" I must be on time policy.
The very cheap policy could be for people who travel a fair amount and cost somewhere around $500-1000 per year, and would pay you if for instance, a plane is delayed, something like $100 per hour of delay with some specific air carriers and perhaps other kinds of transport. The policy holder would need to contact the *On time* travel insurance, and they would have agree that trip was going to be on time and if they didn't inform you in say, 3 hours ahead of time that it was going to be a delay, and it was delayed you would be paid money until you got your flight.

The hideously expensive policy might cost 1-10 million per year and it pays far more money if your flight wasn't on time- AND if you are late for your flight, the insurance could try to get that flight delayed so you can get that flight. Obviously to delay a flight, the *On time* travel insurance, must work some agreement with air carriers- such as they will pay them money to do so- obviously this should only be in rare circumstance and the amount of money quite excessive to insure it is indeed rare. And an exponentially increasing rate for each minute required to delay.

Such a *On time* travel insurance might make good fit with suborbital travel, but it could work without it.

Anyways back to 15 min thing. If you have parties paying for your product because of the time factor and say 6 hour time is worth $2000, and 1 hour trip is worth $200,000, they are paying $180,000 for that 5 hours, or $36,000 per hour and 15 mins is $9000 of his/her time and the SOB probably wants free on board drink.

Let's say you have 6 passengers and 200 lbs of cargo, and passengers and cargo are on the vehicle for 2 hours and passenger pay $200,000 each and cargo cost $200,000, so you getting a revenue of $700,000 per pilot hour, if you reduce that to 1 hour you get $1.4 million per pilot hour.
And if add 15 minutes to one hour you get $1,225,000 per pilot hour.
Now, if the mothership launches 4 per day the addition of 15 mins adds 1 hour per day to it's flying hours, so one will have increase of down time for maintenance and you will less wear and tear on landing gear from take off.

As for the Mag Lev costs. Well, who know much the environment impact studies and/or lawsuits could amount to, possibly more than than it's total cost. And of course twice this cost because you would need one somewhere in Europe. Plus you need a airport for the mothership to land.