My baby is 8 months old now.
I'm certainly not an expert, but I did just switch from breastfeeding/pumping at work to full-time pumping because my DD (now 10 months) was having some weight gain issues.
Any extra pumping will help at the moent. It would be good if you could do it every weekday, but if you can't manage it, then some extra demand is better than none.
The only other thing I could think of is that as the baby would be nursing just six times on weekends (or on weekdays some of this would be