The documentation
Does not state a limit for the channel parameter.
It feels like you can request as many streams as you want via the channel parameter, set the limit to 100 and then use offset to paginate the results.
Personally, if you need to actually lookup this many streams you probably want to use Webhooks instead as documented here:
https://dev.twitch.tv/docs/api/webhooks-reference/#topic-stream-updown