The length of Digimon Story Cyber Sleuth can be quite subjective. On average, it might take you 25 to 35 hours to complete the main story. However, if you want to complete all the side quests and collect everything, it could easily extend to 50 or more hours.
The day one Digimon are usually found in specific areas or quests within the game. You might need to complete certain tasks or explore certain locations to encounter them.
I don't have the exact number off the top of my head. But you could try looking it up on dedicated gaming databases or asking other avid players of Digimon Story Cyber Sleuth.
Black Agumon in Digimon Story Cyber Sleuth can be acquired through a combination of factors. It could involve reaching a particular level, fulfilling certain conditions related to your Digimon team, or interacting with specific characters in the game world.
In Digimon Story Cyber Sleuth, 'abi' might refer to a specific term or code related to the game's mechanics or storyline, but I'm not sure exactly without more context.