Does AGI implies the technological singularity and if not, why not?
b) Even if we say "a human being level of intelligence, whatever that means", the answer is still a maybe. For a singularity you need a system that can improve its ability to improve its abilities, which may require more than general intelligence, and will probably require other capabilities.
Still, scaling up might not be simple if we look at all the human resources currently poured in software and hardware.
So you could pretty easily duplicate the result a couple order of magnitude times.