At one go
Definition 1 of 1
Pro Tip 1/3Colloquial Usage
Used in casual conversations rather than formal writing or speeches. 
I managed to watch the entire season at one go.
Pro Tip 2/3Conveys Efficiency
It often suggests completing a task efficiently without taking breaks. 
She packed all her suitcases at one go.
Pro Tip 3/3Possible Exaggeration
Sometimes, it's used to exaggerate the speaker's ability to do a lot in a single attempt. 
He claimed he solved the puzzle at one go.