They are very slow and will take about a month. My interview was in November and I got my offer letter in January.
Yes, for sure they'll contact you even if you are not going to be selected for the position they are going to call you and thank you for your participation and explain that at the time you were or weren't the person that they were looking for and that they will keep you in their record for future reference. In how long? that depends of how many participants were there and their schedule of course, but don't worry, they'll call you at some point.
Follow up with them with a friendly call and address with their name and remind them of the interview (when/where) it took place. TD bank is usually very busy so they may have forgotten likely to get back to you.
If they make a decision to hire, You will receive an email from TD HR about the decision. If they decide not to hire you, again you will get an email from HR notifying you that you are not being consider.
It is always good to follow up with the hiring manager after a week of interview.
They will contact you if you have received an offer within a week. I have seen rare times where an offer was given after two-four weeks. But if you attended a hiring event, likely it is for an associate role and they are usually very quick to offer. If it has passed a week, I would move on.
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