Similar to Dr-D, I always vacuum after all roasting is complete and I usually do two 1lb roasts back to back. Some beans produce a lot more chaff than others, but unless you are doing a lot of full-load (2lb) roasts back to back, you should be just fine vacuuming once after each roasting session. The Bullet’s chaff collector holds a lot of product.
On the filter basket cleaning, that just depends on how much you roast and how often. I just roast for personal use and do 2-3lbs about every 10 days. In that kind of use, I only need to clean the filter basket about every 5th use. I always vacuum the filter basket in addition to other areas of the Bullet after roasting. When the basket starts getting dingy, I drop it (and the impeller fan) into a 2qt glass Pyrex with hot water and 4-squirts of Urnex. Let is sit for a few hours and everything is clean without any scrubbing. The best-practice with cleaning this stuff (especially with coffee roasters) is not to allow it to get so dirty that it takes a lot of effort to clean.
Have fun with your Bullet!