I work in the EWR area. our area has several radar sectors that I'm sure most of you that are regulars in our airspace are familiar with.

Departure (119.2)
Satellite departure (126.7) only opened at peak times
North Arrival (120.15)
22L final (125.5) combined with North arrival on offpeak times
Yardley (128.55)
Penns. This position is combined with Yardley when landing on 22L, and with North arrival when landing on 4R. Its never opened by itself.
4R final (125.5) combined with Yardley on offpeak times
Metro (132.8) Often combined with Yardley even during peak times if short on staffing
CRDA aka Rwy 11 final. (128.8) Only opened for 11 arrivals when primary rwy is 22L during peak times. When 4R is primary rwy this is combined with Mugzy.
Mugzy (127.6)
Zeebo (123.77) combined with Mugzy 99% of the time. Only opened for superpeak times

We have to maintain currency in all the sectors. I only mentioned the radar ones that you'd be talking to, but we have a few more positions (handoff positions, coordinators, sequencers, flight data, the back) that we rotate as well.