> ## Documentation Index
> Fetch the complete documentation index at: https://docs.uplift.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Time to Ball Contact

> Duration between initiation and ball contact events. This measures the total swing time from start to contact.

## Technical Details

* **Variable Type:** Discrete Metric
* **Data Type:** Float
* **Units:** seconds (s)
* **Column Name:** `time_to_ball_contact`
* **Aggregation:** mean
* **Precision:** 2
* **Calculation:** Ball contact time - Initiation time
* **Typical Range:** 0.75 – 1.02 s
* **Optimal Direction:** Middle — moderate values are optimal

## Description

Time to ball contact measures the total duration of the swing from initiation to ball contact, providing insight into swing timing and rhythm.

## Normative Ranges

Percentile distributions by competition level from the 2026 Q1 dataset; the optimal range spans the 25th–75th percentiles.

| Population         | Optimal Range (25th–75th) | 10th | 25th | 50th | 75th | 90th |
| ------------------ | ------------------------- | :--: | :--: | :--: | :--: | :--: |
| Youth              | 0.76 – 1.02 s             | 0.59 | 0.76 | 0.85 | 1.02 | 1.15 |
| High School        | 0.78 – 1.00 s             | 0.53 | 0.78 | 0.89 | 1.00 | 1.14 |
| College            | 0.70 – 1.03 s             | 0.60 | 0.70 | 0.93 | 1.03 | 1.14 |
| Professional       | 0.74 – 1.04 s             | 0.59 | 0.74 | 0.91 | 1.04 | 1.26 |
| Broad (All Levels) | 0.75 – 1.02 s             | 0.58 | 0.75 | 0.89 | 1.02 | 1.16 |

## Use Cases

* Swing timing analysis
* Rhythm assessment