My 2008 ZZR600 sat for over 2 years, and when I turned the key nothing happened, even with a new battery added.
I put it in first gear and pushed the bike forwards and backwards with the clutch lever out, until the back tire was skidding on the floor. It worked- the starter began turning the engine.
Then I had to deal with old improperly stabilized fuel in the gas tank after the engine started, after several seconds of cranking.
At least you learned quickly and cheaply which mechanic to not trust.
"We have created a Star Wars civilization, with Stone Age emotions, medieval institutions, and godlike technology. We thrash about. We are terribly confused by the mere fact of our existence, and a danger to ourselves and to the rest of life.”
― from Edward O. Wilson, The Social Conquest of Earth.