Examine - rebuilding index speeds

I'm wondering if anyone can comment on speeds in time with rebuilding an Examine index in Umbraco - how long should it take? I have an index set of approx 15000 nodes, it can take 12 hours to a day to rebuild the index, is this normal ? If not, what should I be looking at to improve speeds, as this is causing huge issues with my site I am developing....


This is a companion discussion topic for the original entry at https://our.umbraco.com/forum/48385-examine-rebuilding-index-speeds