How many sessions does chapter 6 and 7 take?

We ended last session with finding the entrance to the netherdeep, then there was a hiatus of 2 months while we played something else

We now set to continue CotN, but it’s almost Sommer and I’m taking holidays in 6 weeks, so I’m wondering if we should keep the hiatus over the summer?

How many sessions does the netherdeep require? We’re quite RP heavy and have used 35 sessions to get here