Depending on where you stay in Glinsk, a free airport shuttle could include a two-way trip to and from the airport or it could be just a one-way trip to your hotel.
How often will the shuttle run?
It depends on where you choose to stay in Glinsk. Some hotels have shuttles that run at regular intervals day and night; others require advanced reservations for custom departures and pick-ups. Check the hotel's policy on Expedia before booking your stay.