Number of visitors isn't an issue, as all accounts here have unlimited bandwidth.
However, there are a few things you should note:
1. Wordpress is notorious for using way too much CPU, and we have scanners in place to automatically suspend accounts for using high resources (such as too much CPU). The best way to avoid this is to 1) install a caching plugin like WP-Supercache, 2) disable any plugins you don't need, especially
SEO/sitemap generation plugins. If you do get suspended for high resources, it is a temporary suspension and you can unsuspend yourself to fix the issue.
2. Load times aren't always the fastest on free hosting and uptime is around 98-99%. While we strive to get 100% uptime and fast load times, please note that this isn't always possible. To get consistently fast load times and a 99.9% uptime guarantee, you should consider purchasing Illuminated or Premium
3. That said, x10 is still a great place to host your site! Should you find yourself running into issues, you can post on the Free Hosting Support forum, where a community support representative can answer your question