Create a running total in SQL with hours but only using work hours

Question

This might be a strange question... but will try to explain the best i can ...

BTW : There is no chance in implementing through Stored Procedures... it should be made in SQL Query only ... But if the only option is SP, then i have to adapt to that ...

I have a table with the following elements :

RUN	WORKORDER	LOCATION	TRAVELTIME	NUMEQUIP	TOT_TIME
NO99	1	Start
NO99	2	Customer 1	112	1	8
NO99	3	Customer 2	18	11	88
NO99	4	Customer 3	22	93	744
NO99	5	Customer 4	34	3	24

I need to add a running DATE and HOUR by calculating the amount of time it takes from one line tho another BUT, and this is important, to take into consideration working hours ( from 9:00 to 13:00 and from 14:00 to 18:00 ( in US format : from 9am to 1pm, and 2pm to 6pm)... As example ... considering that my start date and time would be 10/May/2022 9:00 :

RUN	WORKORDER	LOCATION	TRAVELTIME	NUMEQUIP	TOT_TIME	DATE	TIME
NO99	1	Start				10/05/22	9:00
NO99	2	Customer 1	112	1	8	10/05/22	10:52
NO99	3	Customer 2	18	11	88	10/05/22	11:18
NO99	4	Customer 3	22	93	744	10/05/22	14:08
NO99	5	Customer 4	34	3	24	12/05/22	10:06

This result is achieved by calculating the estimated time to make the trip between customers (TRAVELTIME), and after arriving is also added the time spent on maintenance (TOT_TIME that is Number of Equipments (NUMEQUIP) vs 8 minutes per equipment)... By this, and since customer 3 will have 744 minutes (12 h and 58 minutes) in maintenance... and those minutes will spawn through 3 days, the result should be as shown...

With the following query i can have almost the desired effect... but cannot take into account only work hours ... and all time is continuous...

Select 
     RUN,WORKORDER,LOCATION,TRAVELTIME,
     DateAdd(mi,temprunningtime-TOT_TIME,'9:00') As TIME,
     NUMEQUIP,NUMEQUIP*8 AS TOT_TIME,sum(MYTABLE.TRAVELTIME + 
     MYTABLE.TOT_TIME) OVER (ORDER BY MYTABLE.ORDER) AS temprunningtime 
FROM   MYTABLE

With this query (slightly altered) i get an running TIME, but does not take into account the 13:00-14:00 stop, and the 18:00-9:00 stop...

It might be a bit confusing but any ideias on this would be very appreciated... and i will try to explain anyway i can...