I have 50m ice lines. However the Oxford guide kind of points at 60s being normal. My 60s are rather fat and heavy.
For those that have been and possibly done the longer routes, were 60s useful?
Based on 3 days there last week; useful but not essential.
We benefitted on a couple of multi pitch routes for both maximising the pitches and abseiling after. Some of the descriptions in terms of number of pitches are well off too.
If you're planning to go Kong vinter 60s make life a lot easier.
on some longer pitch routes ( original ascents by army on 70-80m? ropes) you might well avoid having to belay at a very inopportune spots with the 60s. being 5m from a perfect stance and asking partner to simul climb a wee bit was what I remember