Basically what he does is keep up to date on everything that is happening internally which is usually quite a bit. Handles RFCs, reports, documents. Only recently have we begun to implement more automated procedures that would reduce a lot of his work. You can find that here: IBP Dashboard and this system still isn’t 100%.
I’d guesstimate at least 5 hours a week in communication / keeping up to date, doing the multisigs and preparing the monthly outputs another hour or 2. He writes up the quarterly reports which take more time to put together historically which is another 15-20hr/quarter.
It’s ideal to pay him enough to incentivize his participation. I talk with him almost every day (about IBP related stuff). In one of the last 2 polkadot proposals, I don’t remember which, we revamped that seat (as well as removing the janitorial advisor role), and the pay was increased based on an hourly rate and 40 average hours per month.