What is the life expectancy for a CHF patient with hodgkin lymphoma if they are not treated?

Depends. Hodgkin lymphoma is a highly curable cancer. Severe CHF might limit some of the chemotherapy options, but even in the unusual circumstance that no chemotherapy could be given, cures can still be achieved with radiotherapy alone. Life expectancy for untreated disease depends on a number of factors but is likely to be only about 12 months on average with some doing better and some worse.
Depends. Some h lymphomas are slow growing, some are not, also stages and other prognostic scores are important, but in general it can range from a month to many months, rarely years if left untreated. It is a curable disease if treated right in many cases. If one has CHF there are other options of treatment that is without any cardiac toxicity.