So... a 24hr period on earth, one day, would be a little over 6 months in the isekai world.
Yeah, that seems difficult to do steady business, honestly.
Edit:
After finishing this chapter, I think that were just supposed to ignore the actual values given to anything; if we actually follow what the stated values are, the money would be
1 copper = ten cents (or a dime)
1 silver = 10 dollars
1 gold = 1000 dollars
And then they are selling a meal for a dollar.... but two meals and a bed is a thousand.
So, between the time being cray, and the money being cray... I'm guessing we're just supposed to roll with it.