No, we'd never bill two clients for the same hour. Very few (no?) T&M arrangements where that would be legally/ethically/morally acceptable. We simply let the

No, we'd never bill two clients for the same hour. Very few (no?) T&M arrangements where that would be legally/ethically/morally acceptable. We simply let the team bill to multiple contracts. The contract & dev managers were responsible for authorizing the time and ensuring it was necessary/suitable/etc. A typical T&M contract considers something around 1920 billable hours per year an FTE. 40 hrs a week, 4 weeks of vacation/sick time/etc per year. The typical way to manage those contracts at scale is hire one person per 1920 hours on a contract, then that person works exclusively on that contract. We didn't allocate one person to a single contract, but fractions of a person - based on how much we estimated any given contract would need a certain set of skills: "Joe's 20% on Project X and 80% on Y. Valerie's 100% on Y. Bill's 80% on Y and 20% on Z." Of course, those are just estimates and nothing ever goes to plan - and it's always hard to hire enough good people. As a result, there were always opportunities for folks to do more work - either on their primary contract(s) or supporting another. It makes the contract management harder, but it provides meaningful benefits to both the team and the clients.