I have for years often collected loads over several days ... 3 to 4 is not unusual ... no odor or bugs.
An odor did develop from morn to evening or evening to the next morn or noon when running Rinse/Hold on the KDI-17a according to its intended usage. I found that odor was avoided by not running Rinse/Hold so as to not have the machine and accumulating dishware moist with residual dirty water.