semi-monthly:
http://www.nhl.com/nhl/en/v3/ext/CBA2012/NHL_NHLPA_2013_CBA.pdf
From Exhibit 1 of the CBA:
Payment of such Paragraph 1 Salary shall be in consecutive semi-monthly installments on the 15th and 30th day of each month following the commencement of the NHL Regular Season or following the dates of reporting, whichever is later (provided that the pay period shall not close more than three (3) days prior to payroll dates); provided, however, that if the Player is not in the employ of the Club for the whole period of the Club's NHL Regular Season Games, then he shall receive only part of such Paragraph 1 Salary in the ratio of the number of days of actual employment to the number of days of the NHL Regular Season.