Well, if it's rendering without errors on your local machine, it wouldn't be Corona I would say. How long does the scene take to set up on your machine (ie how much of the time is Scene Parsing and Geometry, in the VFB stats), that would give you an idea of the part of rendering that can't be done faster when distributed to multiple nodes, each machine would have to do that for itself. Then it contributes to the actual passes part of the renders, and that part of the time should be, say, 25 times faster (though maybe less, maybe more, depending on what nodes they distributed it to vs. your local computer).
As a note, TR is not the world's most robust system, and in general for large resolutions (which resolution was this?), you can need to adjust the TR settings - they should be set to Arbitrated, and then the packet size should be raised (e.g. 128MB vs 2), and the interval to send should be raised (eg to 30s from 5s).
EDIT Looks like 3800 x 2850, could be worth sharing what your TR settings are under the Corona render settings. If they are default, that might be the cause (what can happen, I believe, is too much data is sent too frequently, which leads to network congestion and lost data, which slows things down)