You won't be able to arrive, ship your vehicle, and bugger off on the same day - we suggest giving yourself 48 hours for freight procedures, unless you're at the finish line over the weekend - in which case it'll be more.
When you arrive at the finish line you'll have to decide the fate of your steed. Your vehicle must leave Russian soil. If you can't face the prospect of driving home, there is the option of using your deposit to ship your vehicle back to the EU.
You'll be able to use the shipping as long as the finish line is open which is the 9th of August until the 10th of September.
To ship, your car will need to fit in with the following restrictions:
Max length: 4700 mm
Max width: 2150 mm
Max height: 1900 mm
Max weight 1500kg