The default time unit is seconds (s), but can be specified as one of: s (seconds), ms (milli-seconds), us (micro-seconds), ns (nano-seconds), ps (pico-seconds), m (minutes), or h (hours).
The seconds argument is retained for compatibility as an alternative for count and is interpreted the same way with regards to the value of unit.
If no processor is specified, the currently selected frontend processor is used. If object is provided, then the breakpoint functionality is added on that object.