In snatches
Definition 1 of 1
Pro Tip 1/3Fragmented Attention
Used when concentration or attention is broken up into parts rather than continuous. 
I read the report in snatches between meetings, so I might have missed some details.
Pro Tip 2/3Disrupted Activity
Refers to doing something with frequent pauses, not all at once. 
She managed to finish her artwork in snatches, despite constant interruptions from her toddler.
Pro Tip 3/3Partial Experience
Indicates experiencing something in brief, separate moments. 
During the noisy party, I only heard their conversation in snatches.