Hi,
I don't know how to works Facebook opening hours but can manage this with conditions, HTML delimiter type field and Content Plugin

Small example

Create fields to add opening hours
- radio with these options (hidden on profile page)
1|2 openings
2|1 opening
3|open 24 hours

- checkbox with opening days (hidden on profile page)
1|Monday
2|Tuesday
3|Wednesday
.....

- select with opening hours 1 (hidden on profile page)
00:30|00:30
1:00|1:00
1:30|1:30
2:00|2:00
....
24:30|23:30
00:00|00:00

- select with closing hours 1 (hidden on profile page)
00:30|00:30
1:00|1:00
1:30|1:30
2:00|2:00
....
24:30|23:30
00:00|00:00

- select with opening hours 2 (hidden on profile page)
00:30|00:30
1:00|1:00
1:30|1:30
2:00|2:00
....
24:30|23:30
00:00|00:00

- select with closing hours 2 (hidden on profile page)
00:30|00:30
1:00|1:00
1:30|1:30
2:00|2:00
....
24:30|23:30
00:00|00:00

- Delimeter for 2 openings with this description (hidden on edit profile page)
{user opening_days_alias_field} {user opening_hours1_alias_field}-{user closing_hours1_alias_field} {user opening_hours2_alias_field}-{user closing_hours2_alias_field}

- Delimeter for 1 opening with this description (hidden on edit profile page)
{user opening_days_alias_field} {user opening_hours1_alias_field}-{user closing_hours1_alias_field}

- Delimeter for 24 hours opening with this description (hidden on edit profile page)
{user opening_days_alias_field} 24/24h

Now set conditions on type of opening field like these
Condition 1 - if greater than 1 hide "opening hours 2" and "closing hours 2" fields
Condition 2 - if greater than 2 hide "opening hours 1" and "closing hours 1" fields
Condition 3 - if equal to 1 show Delimeter for 2 openings
Condition 4 - if equal to 2 show Delimeter for 1 opening
Condition 5 - if equal to 3 show Delimeter for 24 hours opening

RESULT of conditions
if I choose 1 opening
- Condition 1 hide "opening hours 2" and "closing hours 2" fields so I can choose only "opening hours 1" and "closing hours 1" fields
- Condition 2 is not met so show "opening hours 1" and "closing hours 1" fields
- Condition 3 is not met so hide Delimeter for 2 openings
- Condition 4 is met so show Delimeter for 1 opening
- Condition 5 is not met so hide Delimeter for 24 hours opening