ok, open for business again...
suggested rules:
1. extraction always starts at #9 am# and will be computed for 8 hrs.
2. on first day of extraction, any extraction done Before #9 am# will be taken and computed for 8 hrs only.
3. on first day of extraction, any extraction done After #9 am# (10am-onward), the ending time will be #5 pm#.
4. when continued the next day, when extraction time ends between #7 am# and #9 am#, credit hrs will always be 1 hr.
5. when continued the next day, when extraction time ends after #9 am# (10am-onward), the starting time will be #8 am#.
6. extraction expands more than 1 day, same rule (rule 4 & 5) applies for the first day and last day of extraction.
7. in between dates shall automatically computed as 8 hrs.
for your review and revision.
if all is ok, then let's do it.