Hello @fabricio_jesus,
Thank you for your interest in using LastPass.
If you decide to use LastPass as Free, there is no expiration data or time for it. As @jepennymentioned, you can check our pricing page to check the differences and the comparison table in between our plans and decide if you would like to keep the Free version or upgrade.
Let us know if further assistance is required.
Thank you,
Karol | Customer Care
There is no trial period that expires with a free account. You can compare the features of a free and paid account here:
https://www.lastpass.com/pricing/lastpass-premium-vs-free