-len

Etymology
Probably a compound suffix from meaning past a certain time, space or number.

Suffix

 * 1)  Usually added to words ending in the terminative case suffix  and it means the inclusion of the mentioned boundary (not just up to the boundary).

Usage notes

 * Variants:
 *  is added to back-vowel words
 *  is added to front-vowel words

Etymology
. Analyzable as +.