Re: Is two Days a week enough?
Everybody's different. For some, twice a week is adequate to meet their needs and expectations. For others, it's not. And for still others, it's the best that can be done, and it looks like you are in this category. Certainly, two days is better than no days.
You can supplement your non-dojo days by stretching, breathing exercises, single weapons training, meditation, ukemi practice (if you have the room), and by watching the plethora of video material available, and reading the books that spark your interest. For many, aikido is also a mental process and discipline which broadens out into all areas of their lives, so that aikido is really something they do every day.
Train when you can, and be sure to relax and enjoy the journey.