Activity H must be analyzed within the context of the critical path of the project. Initially, the path under consideration (A-B-E-H-J) has a duration of 26 days, assuming B takes 5 days. If Activity B is extended to 8 days, it consumes 3 additional days out of its float time. Thus, the float usage does not directly impact the critical path duration immediately as other paths might still remain longer. However, considering the critical path dynamics and without extensive float recalculations, if Activity H delays any further, it might push the entire project timeline over its limit, leading to zero days of allowable delay for Activity H.