Marketo Activity stored in RTCDP B2B

[ScottTh2]

How long can you store activity event data from Marketo in B2B RTCDP/AEP? I know Marketo does not maintain this data after 90 days but I was under the impression, that like other CDPs, this data can be stored for as long as necessary without much concern in AEP. I have heard talk about there not being an 'upcert' in B2B, unlike in B2C, which would prevent B2B from maintaining this data long term - basically until I want to remove it. 🙂  Looking for confirmation that this is not accurate and B2B maintains Marketo Activity data well beyond the 90 days.