In between

It's early morning as the herdsmen are setting out on their way with the droves of swine while Eumaios and Odysseus are preparing breakfast, though after another night of storytelling and drinking wine, it probably wouldn't have been at the crack of dawn. If we assume Telemachos left the nearest shore at first light, say around 6:30 hrs, he would've arrived at the latest at 8:30, an hour after sunrise on December 18th.

In between Korax and Arethousa

You will find him tending the swines who are grazing beside the rock of Korax and the fountain of Arethousa......

Odyssey Book 13 line 377-381 Barry B Powell
Odyssey Book 16 line 1-5 Barry B Powell

We paused at the bus stop, which would've been an odd thing for Telemachos to do, so while the trip took us about two hours (stop not included) and what with Telemachos being just the slightest bit younger and fitter, we can presume it would've taken him less time. Homer doesn't specify when Telemachos starts his trip, but he does describe when he arrives:

Odysseus and the pig herder had started a fire and at dawn were making ready their breakfast. They had sent forth the herdsman with the droves of swine, but the baying hounds fawned around Telemachos and did not bark as he drew near.

This picture clearly shows that Eumaios' hut is located squarely between Korax and Arethousa, which is the area where Eumaios' pigs are said to dwell:

Eumaios

Korax

Arethousa