Moving Bottles of Scotch and Cork Contact

[Islay Peat]

Having recently read about the necessity of keeping scotch out of contact with the cork I was wondering while driving with a load of bottles how long it was allowable to keep them in a prone position.

Also the bottles in my suitcase a couple weeks ago were definitely prone for most of the trip.

So how serious is the problem of scotch to cork contact and what are the allowable time frames?