N.D. Cent. Code § 44-09-05
The senate, whenever articles of impeachment are presented to it by or on behalf of the house of representatives, must assign a day for the hearing of the impeachment and inform the house thereof. The day so assigned may not be earlier in the session than that at which the completion of the business of the legislative assembly may be effected. All steps and preparations necessary may be taken and made from time to time during the session to enable the trial to begin immediately upon the completion of the business of the legislative assembly. The president of the senate or other person presiding therein must cause a copy of the articles of impeachment with a notice to answer the same, at the time and place appointed, to be served upon the accused not less than twenty days before the day set for the trial.
N.D.C.C. § 44-09-05