Just a comment, the images you've shown are for a steady calculation.
In transient you will expect to see a saw tooth residual profile as the solver converges each time step, updates time (residual spikes) and then converges for as long as you give it.
If the water didn't come in through the inlet, check you've got the phases defined correctly, and have the correct phase assigned to the inlet as it's easy to get that wrong (everyone does it at least once).
Parallel will speed up the simulation, but transient CFD calculations do take time, and 8 hours isn't actually that bad. Only tutorials typically run in tens of minutes, everything else will take a while longer.