Laravel Rate Limiting Limit

Hello Everyone,

May I know what is the highest rate limiting number we can set with Laravel? I have tried to check with default and via google, but I can't able to get this.

In my project, there will be 100,000 viewers in case of a big launch. So on this scenario, the customers will be accessing the page, which calls the Laravel backend API. Sometimes we are getting 429 status with a message of "Too Many Attempts" error. Can anyone guide me what's the best way to handle this?

FYI: I have already increased the Rate Limit to a high number, but still I am getting the 429 issue.

api.php
Route::middleware('throttle:10000000,1')->group(function () {
    Route::get('/api1',[CLASS::class,'method'])->middleware(['auth:sanctum']);
    Route::get('/api2',[CLASS::class,'method'])->middleware(['auth:sanctum']);
});

So if anyone can help me on this, it will be appreciated.

Thanks in advance.