Why does Vanguard take over one day to convert after-tax 401(k) to 401(k) Roth within one's plan? Why isn't it faster, or even immediate? For example, if one initiate the conversion on Saturday noon PT, the conversion will take place on Monday evening PT.
Among other things, I wonder whether the delay results from some regulations.
The motivation behind converting after-tax 401(k) to 401(k) Roth faster is to avoid tax on earnings (What are the pros and cons of converting an after-tax 401(k) to a Roth 401(k)?).