Question about the balance between leading and coding at architecture level

For architects and high level developers, how do you balance your working time, so that:

a) You still know how to code, on current technology, so you can pick the right languages/frameworks and help the developers during implementation

b) You do not take on too much production coding yourself, so that the team can scale up to high levels without you becoming the blocker, i.e. you are overwhelmed with a mixture of leadership and coding tasks

So as the architect/leader, do you write any production code? Thanks!