API suggestion - make time & increment consistent between challenge & board/seek

The calls use two different sets of parameters. Also, the "time" is seconds in one and minutes in other.

Since these are already in the field, my suggestion is look for both ways on both calls.

Start by comparing the challenge and board/seek API calls and their documented parameters, focusing on the time and increment fields. Determine the intended units and shared parameter set from the existing API documentation and examples; done means both calls consistently support the agreed fields and time units.

Written by the indexing model from the issue text.