No! The punishment must run consecutively. It cannot be broken up into weekends and week days. Please see the reference below.
AR 27-10 3-19(8) Combination and apportionment. With the following exception, punishment authorized under UCMJ, Art. 15(b) may be combined: No two or more punishments involving deprivation of liberty may be combined, in the same nonjudicial punishment proceedings, to run either consecutively or concurrently, except that restriction and extra duty may be combined in any manner to run for a period not exceeding the maximum duration that can be imposed for extra duty, by the imposing commander. Once commenced, deprivation of liberty punishments will run continuously, except where temporarily interrupted due to the fault of the Soldier, or the Soldier is physically incapacitated, or an appeal is not acted on as prescribed in paragraph 3–21b. (See para 3–21c, below regarding the circumstances when deprivation of liberty punishments, imposed in separate nonjudicial punishment proceedings may run consecutively.)