do you coincidentally know an estimate of how often that'd typically be?

  {
      "message": [
        "Browser DO: Could not start browser instance. Error: Error: Unabled to create new browser: code: 429: message: Too Many Requests",
        "Error: Unabled to create new browser: code: 429: message: Too Many Requests\n    at PuppeteerWorkers.launch (index.js:19201:13)\n    at async Browser2.fetch (index.js:43967:24)"
      ],
      "level": "error",
      "timestamp": 1702366528655
    }

  {
      "message": [
        "Browser DO: Could not start browser instance. Error: Error: Unabled to create new browser: code: 429: message: Too Many Requests",
        "Error: Unabled to create new browser: code: 429: message: Too Many Requests\n    at PuppeteerWorkers.launch (index.js:19201:13)\n    at async Browser2.fetch (index.js:43967:24)"
      ],
      "level": "error",
      "timestamp": 1702366528655
    }

  async fetch(url: string) {
    //if there's a browser session open, re-use it
    if (!this.browser || !this.browser.isConnected()) {
      console.log(`Browser DO: Starting new instance`);
      try {
        this.browser = await puppeteer.launch(this.env.CHROMIUM);
      } catch (e) {
        console.error(
          `Browser DO: Could not start browser instance. Error: ${e}`,
          e.stack
        );
        throw e;
      }
    }
   .......
  }

  async fetch(url: string) {
    //if there's a browser session open, re-use it
    if (!this.browser || !this.browser.isConnected()) {
      console.log(`Browser DO: Starting new instance`);
      try {
        this.browser = await puppeteer.launch(this.env.CHROMIUM);
      } catch (e) {
        console.error(
          `Browser DO: Could not start browser instance. Error: ${e}`,
          e.stack
        );
        throw e;
      }
    }
   .......
  }

 async alarm() {
    this.keptAliveInSeconds += 10;

    // Extend browser DO life
    if (this.keptAliveInSeconds < KEEP_BROWSER_ALIVE_IN_SECONDS) {
      console.log(
        `Browser DO: has been kept alive for ${this.keptAliveInSeconds} seconds. Extending lifespan.`
      );
      await this.storage.setAlarm(Date.now() + 10 * 1000);
      await this.browser.version();
    } else
      console.log(
        `Browser DO: exceeded life of ${KEEP_BROWSER_ALIVE_IN_SECONDS}. Browser DO will be shut down in 10 seconds.`
      );
  }

 async alarm() {
    this.keptAliveInSeconds += 10;

    // Extend browser DO life
    if (this.keptAliveInSeconds < KEEP_BROWSER_ALIVE_IN_SECONDS) {
      console.log(
        `Browser DO: has been kept alive for ${this.keptAliveInSeconds} seconds. Extending lifespan.`
      );
      await this.storage.setAlarm(Date.now() + 10 * 1000);
      await this.browser.version();
    } else
      console.log(
        `Browser DO: exceeded life of ${KEEP_BROWSER_ALIVE_IN_SECONDS}. Browser DO will be shut down in 10 seconds.`
      );
  }