Capped, Not Unlimited: A Daily Short-Video Ceiling and Sustained Reading Capacity
Abstract
Adults who set and largely held to a self-imposed daily ceiling on short-form video apps (roughly 25 minutes/day, using a built-in app timer, "capped," n=109) sustained longer continuous reading sessions after six weeks than adults with no such ceiling ("uncapped," n=105) — 34 minutes versus 28 minutes average session length, a 21% gap — and reported a higher reading-flow score (7.1/10 vs. 5.8/10, a 22% gap). The two groups did not differ meaningfully in total time spent on social platforms overall (52 vs. 55 minutes/day), indicating the reading-capacity gain was not attributable to an overall reduction in device time.
1. Introduction
Short-form video is frequently described as difficult to disengage from once started, and is often discussed alongside a perceived decline in sustained reading. We asked whether adults who imposed a specific, held-to daily ceiling on short-form video consumption — rather than avoiding the format entirely or using it without limit — differed in their capacity for sustained reading from adults using the same apps without a ceiling.
2. Method (Summary)
We recruited 214 adults who used at least one short-form video app regularly (self-reported baseline use of 45+ minutes/day) and wished to read more. Participants were randomly assigned to set a daily in-app timer ceiling of their choosing, averaging 25 minutes (capped, n=109) or to continue their existing habits with no ceiling (uncapped, n=105). App-reported usage logs (with consent) verified ceiling adherence, defined as staying under the self-set limit on at least 80% of days; 14 participants who fell below this threshold were retained in an intent-to-treat analysis. The same consented usage logs also captured total daily time across all social and video apps on the device, not only the capped app. After six weeks, participants completed a supervised sustained-reading task (read a novel excerpt for as long as comfortable, uninterrupted) and a reading-flow self-report scale.
3. Findings
The capped group's continuous reading sessions averaged 34 minutes versus 28 minutes for the uncapped group, a 21% gap. Reading-flow scores were 7.1/10 versus 5.8/10, a 22% gap. Total daily time across all social platforms (not only short-form video) was 52 minutes for the capped group versus 55 minutes for the uncapped group, a difference not distinguishable from chance, indicating the capped group's gain in reading capacity was not simply explained by spending less time on devices overall.
4. Discussion
The results are consistent with a pacing account rather than a total-abstinence account: participants did not need to eliminate short-form video use to achieve greater sustained reading capacity than peers without a ceiling, only to bound it. That the two groups' overall device time converged, while their reading capacity diverged, suggests the gain is tied specifically to holding a ceiling on short-form video rather than to reducing screen engagement across the board.
5. Limitations and Future Directions
The reading-flow measure relied on self-report, and the supervised reading task, while standardized, is an imperfect proxy for unsupervised reading behavior at home. Ceiling adherence was self-selected in the sense that participants chose their own limit, which may have been set at a level each participant already found achievable. The six-week window does not establish whether the gap persists over a longer horizon or whether it would generalize to participants who did not already want to read more. A planned follow-up will track unsupervised reading via a voluntary reading-time log over three months.
Editorial Note
This report underwent CfAHC's Rapid Review Protocol, including AI-assisted literature cross-checking and a two-reviewer human sign-off.