sorry to hear you are having problems with your migration. what module are you referring to? the Dolphin 6.1.6 migration module?
not clear on the direction to give here, as there is not enough history on what you are doing:
1. version you are migrating
2. location and path of 7.0.8 (presuming you are upgrading from 6.1.6 ---> 7.0.8)
3. max_execution time setting on current install
this sounds like you are possibly timing out on the migration if you are using the dolphin 6.1.6 migration tool and are in fact upgrading from 6.1.6 --> ^
there is no easy answer on how to do this transition manually, and that was the reason behind releasing the upgrade (migration) module.
from dolphin 6.1.6, which is where the site would have to be upgraded to manually, using the various upgrade patches, then you could at that juncture, use the migration module or that is what is inferred. i have never done that specific method, and have always taken the long road, upgrade 6.1.6 ---> 7.0.0, then apply the upgrade patches one by one.
When a GIG is not enough --> Terabyte Dolphin Technical Support - Server Management and Support