About 3, 500 characters are in everyday use.

目前日常使用的汉字是3500个左右。

That depends on your goals (everyday use of the word.)

这取决于你的目标（每天单词的使用）。

The problem was that it was to valuable for everyday use.

问题是它太贵了，不宜做日常书写之用。

The problem was that it was to valuable for everyday use.

是它太贵了，不宜做日常书写之用。

The problem was that it was too valuable for everyday use.

问题是它作为日常之用太贵重了。