formats time elapsed since the given start time in nanoseconds . concode_field_sep PlaceHolder placeHolder concode_field_sep String getSizeFromBytes concode_elem_sep long parseSpaceSize concode_elem_sep String parametersToString concode_elem_sep String byteBufferToString concode_elem_sep String formatMode concode_elem_sep String formatTimeTakenMs concode_elem_sep String byteArrayToHexString concode_elem_sep String byteArrayToHexString