In the Dutch Lexicon Project, we collected lexical decision times for 14K monosyllabic and disyllabic Dutch words. The Dutch Lexicon Project 2 (DLP2) contains lexical decision times for 30K Dutch lemmas. These include almost all words regularly used in Dutch, independent of length.
The reference to this database is:
Brysbaert, M., Stevens, M., Mandera, P., & Keuleers, E. (2016). The impact of word prevalence on lexical decision times: Evidence from the Dutch Lexicon Project 2. Journal of Experimental Psychology: Human Perception and Performance, 42, 441-458. pdf
These are files you may find interesting: