I participated in an initial phone interview w/HR for 30 minutes. The next step was a 4-hour interview process that included a presentation on the value proposition of their product (20 minutes - 6 people present), then lead a 20 minute brainstorming session, and finally wrapped up with 5 x 1:1 interviews (30 miinutes each). The final step would have been a 1:1 interview with the CMO (I did not make it that far).