We don’t focus on length, but on complexity. That said – at least 10 characters, digits and symbols.
The second question can’t be answered in a precise way. AxCrypt uses a dynamic number of iterations to strengthen the effective password length with 12-14 bits (very approximately and it depends on the encrypting computer). The speed of the “super computer” is affected by the amount of money spent on it.
The better questions are:
1) What is the effective length of your password? Our password manager generates strong passwords at around 90 bits.
2) How many bits effective key length / second do you think the presumed attacker has a budget for?