I tried old Azo F2 and got 21 minutes or something with pretty normal negative
Old Velox F3 -which should be slower than a grade 2- and got about 16 minutes same negative
remember Velox is faster than Azo
Another old contact paper grade 2 and had exposure about 14 minutes which means it is probably about the same speed grade for grade as Velox

From what I've read =little
Lodima is faster than Azo
probably not too much slower than Velox ..or about halfway between the two

I think 16-18 would be just about right depending on neg density
Try 4x5 to 8x10 at f9 dodging/burning for like 60 minutes and I'd also bet it would be the last or second to last time ever attempted
Then again
Alter the negative to take into account dodge/burns or build a second negative and perhaps it's worthwhile to enlarge 4x5 to 8x10 onto Lodima once in a while