Beware, older languages below! The languages below were invented during Tolkien's earlier period and should be used with caution. Remember to never, ever mix words from different languages!

Qenya 

hrillume

adverb. *many times

The correlative ᴹQ. hrillume or hrímallume appeared in Demonstrative, Relative, and Correlative Stems (DRC) from 1948 (PE23/110), a combination of ᴹQ. hrim- “many” and ᴹQ. -llume “times”.

Neo-Quenya: For purposes of Neo-Quenya I would adapt this to ᴺQ. rillumë “many times, frequently” using rim- “many” to be more compatible with Tolkien’s later writings.

hrímallume

adverb. *many times