How much could Tom Dumoulin afford to be behind in final Giro d’Italia time trial?

Dumoulin will try to limit his losses to the better climbers in the coming Giro d'Italia mountain stages, but how much time could he afford to be behind before the final time trial?

Tom Dumoulin will try to limit his losses to the better climbers in the coming Giro d'Italia mountain stages, but how much time could he afford to be behind before the final time trial?