et in blocks (1 - 1008)
2. estimate_mode    (string, optional, default=CONSERVATIVE) The fee estimate mode.
                    Whether to return a more conservative estimate which also satisfies
                    a longer history. A conservative estimate potentially returns a
                    higher feerate and is more likely to be sufficient for the desired
                    target, but is not as responsive to short term drops in the
                    prevailing fee market.  Must be one of:
     