It took Zeref approximately 3 years and 3 months within the time-space - almost equivalent to one day in the outside world - to max out his cultivation to the brim of the Mana pool stages. He had 120 years in the time-space to get as strong as he could before they would begin their first retaliation in several years.
The Monarchs had left after 1 whole year had passed of just combat training, only the Beast Monarch stayed behind to practice his skills and polish his Combat prowess. He was currently the strongest monarch in terms of brute strength and in hand-to-hand combat, only once second to the Strongest Sovereign.
The Monarch Rank.
It was a rank that signified a being stepping into new heights, into new dimensions. Changing from being a mortal to something completely different, expanding their lifespans by several folds.
