Hi

It donates hashpower - 5% means 5 minutes in 100 minutes.  If you lower it to 1% then it's 1 minute in 100 minutes. You can set the length of the main refresh cycle yourself, by default it's 15 seconds but if you set it to more than a minute then it will donate for longer because it will only update everything on the interval that you set.

We currently support excavator, two variants of ccminer and xmrig_nvidia.  Support is planned for as many miners as possible and our shim project excavataur wraps any cli-based miner with a generic excavator-like API interface so they're very easy for us to add.

Is this the one you're talking about?   https://bitcointalk.org/index.php?topic=2021765.0