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For this very reason, we no longer encourage customers to implement it the way you do. Instead, we keep the confirmation in the "Fills out form" triggered campaign, but for the reminders, we create 2 email sub programs or 2 simple batch smart campaigns that qualify all registered and send them the appropriate "1 day left", or "1 hour left" reminder email, and we schedule these 2 campaigns at the right time.
There is also another advantage of doing it with separate campaigns : timeliness and execution priority. The 1 hour left email needs to be sent right on time, not 30 minutes later. Batch SC starting with a "send email" have a much higher priority in Marketo than emails sent after a wait step, that can be delayed if your instance is very loaded at the same moment.
Generally, I agree with Greg.
But you can have separate flows that Remove from Campaign if the lead fills it out again and is already a Member of the first campaign.