Hmmm many questions, I am using the EEA Family Permit Application VAF5

One of the example is the one I mentioned above, How long do I intend to stay? When will I leave UK? The thing is how can I tell when will I leave, for as long as my husband is there but it needs a date answer and we cannot move to the other questions to answer other questions first or leave this blank it seems that all questions are mandatory.