Because of the dynamic nature of IPs, and the related risk of collateral damage, most blocks should be in the range of 24 hours to 1 month, with exceptions noted below. Only in very rare cases should non-proxy IPs be blocked for more than three months. When considering blocking, it is important to remember the axiom "Never attribute to malice what can be attributed to stupidity"—article blanking or similar apparent vandalism may be just a well-meant attempt to expand the wiki. Always assume good faith, but remember that the rules apply to everyone equally.