Build settings UI states max build time is 8 hours

### Before opening, please confirm:

- [X] I have checked to see if my question is addressed in the [FAQ](https://github.com/aws-amplify/amplify-hosting/blob/master/FAQ.md).
- [X] I have [searched for duplicate or closed issues](https://github.com/aws-amplify/amplify-hosting/issues?q=is%3Aissue+).
- [X] I have read the guide for [submitting bug reports](https://github.com/aws-amplify/amplify-hosting/blob/master/CONTRIBUTING.md).
- [X] I have done my best to include a minimal, self-contained set of instructions for consistently reproducing the issue.
- [X] I have removed any sensitive information from my code snippets and submission.

### App Id

N/A

### AWS Region

us-east-2

### Amplify Hosting feature

Build settings

### Frontend framework

Next.js

### Next.js version

13

### Next.js router

App Router

### Describe the bug

The build settings UI states "The maximum build timeout is 8 hours." However if you try to save anything higher than 120 minutes, it says "Updating build settings failed. Build timeout cannot exceed 120 minutes."

I have a project that needs to build 2738 SSR pages. The build is expected to take very close to 120 minutes and possibly slightly more. If I cannot extend my build timeout beyond 120 minutes, Ampllify may not work for me. Maybe it could be a quota that defaults to 120 but could be increased.

### Expected behavior

Entering 480 minute build timeout should work based on stated 8-hour maximum.

### Reproduction steps

1. Open build settings.
2. Note that it says "The maximum build timeout is 8 hours."
3. Try to enter a value higher than 120 minutes and save

### Build Settings

_No response_

### Log output

```
# Put your logs below this line

```

### Additional information

_No response_

Start by reproducing the mismatch in the Build settings UI: compare the displayed eight-hour maximum with the validation error when saving a value above 120 minutes. Trace the setting's validation and update path, then confirm that the accepted limit and displayed guidance agree, including the reported 480-minute value.

Written by the indexing model from the issue text.