declare @clockIn time = '08:00'
declare @clockOut time = '19:00'

declare @a time= '00:00'
...all possible limits defined here...
declare @f time= '23:59'

tests using clockIn only:

-- ab overtime
if (@clockIn >= @a and @clockIn < @b)
begin
 set @ax = @ax + ABS(DATEDIFF(hour,@a,@b))
end
-- cd work
if (@clockIn >= @c and @clockIn <= @d)
begin
 set @at = @at + ABS(DATEDIFF(hour,@c,@d))
end
-- ef lunch
if (@clockIn >= @e and @clockIn <= @f)
begin
 set @ai = @ai + ABS(DATEDIFF(hour,@e,@f))
end
-- gh work
if (@clockIn >= @g and @clockIn <= @h)
begin
  set @at = @at + ABS(DATEDIFF(hour,@g,@h))
 end
-- ij overtime
if (@clockIn > @i and @clockIn < @j)
begin
 set @ax = @ax + ABS(DATEDIFF(hour,@i,@h))
end

select @ax as overtime,@at as work,@ai as lunch