ABM completes a scan within a minute or two but EPG with VOD section ticked can be 40+mins, without VOD it's only about 5 mins if that so the only difference you would see is the box would be slow or none responsive IF you were to use the box while it is pulling in EPG but this would be more relavent to mipsel systems as they have less resources to start with, outside of this you wont notice anything unless the problem lies within the process of getting the EPG which is entirely possible as the system could be left hanging while it waits for a response from the EPG/Source software.
do you have EPG set to clear/erase before importing new? a pure guess given you had an 'erase' error but it could just as easy be the system ram not dumping handled packets