After how many years was the road connecting Zazesspur and Akkabbel finally completed?
Here's what the lore says, drawn directly from the indexed sources:
-1130 DR * Beholders lay seige to Akkabbel in the Ithal Pass in Calimshan. The garrison receives reinforcements from Calimport via a magical portal cast by the vizar Ali el Samesaj. In the Battle of the Samesaj Gate, the defenders and reinforcements break the siege as the beholders suffer significant losses. The portal remains intact following the battle, known only to Ali to be keyed to the light of the full moon. * For his efforts, Ali el Samesaj is named Grand Vizar and serves as Syl-Pasha Ruj el Drakhon's side. * A long-awaited road linking Zazesspur with the garrison at Akkabbel is…
Source: -1130 DR
-1067 DR * Calishite forces continue to expand northward after endless battles with the elves of Tethir. They claim and occupy the ancient dwarven redoubt of Velmhold and renovate it for human-sized habitation. They name it Zazessovertan, meaning "fortress overlooking Zazesspur", and use it as a base to patrol the Trade Way.
Source: -1067 DR
-110 DR * In Myratma, Akkabar el Shoon is born to a Calishite noble and a favorite harem girl. They return to their home in Memnon.
Source: -110 DR
-1069 DR * The Orcgate Wars end as the orc horde and their gods are finally defeated in the Priador and scattered throughout the region. * Following the war, the Nar, Rashemi, Raumviran, and Sossrim mercenary tribes make their way home. * The Nars establish a series of small kingdoms over the course of a century. The greatest is Ashanath by Lake Ashane.
Source: -1069 DR