Squid use TTL of 60 seconds for DNS resource records with TTL smaller than
that value.

Some sites can have DNS TTL set to lower value due to high availability
design (DNS load balancer).

In RFCs [1][2][3] it is explained the received TTL can be lowered to the
upper bound TTL value of DNS cache, but not to increase it.

Is it possible to change that 60 seconds default somewhere in
configuration? Was the 60 seconds default chosen according some reference?

[1] https://tools.ietf.org/html/rfc2181#section-8
[2] https://tools.ietf.org/html/rfc1035#section-3.2.1
[3] https://tools.ietf.org/html/rfc7719#section-4

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