Typically, one would include visiting a webpage as a behavioural lead scoring rule and trigger an alert to notify sales when score > x.
However, if you strictly want to trigger an email alert once 20 webpage visits have been clocked, create a custom field, type = score, as a counter
Create a smart campaign and allow leads to run through every time.
trigger = visit webpage is any
flow = change score is custom score and value is +1; send alert if custom score = 20
you can also add an optional step of resetting the counter at 20 so that sales is alerted again if the lead hits another 20 webpages
That campaign will trigger a ton of times and, depending on the volume of your web traffic, can lead to campaign backlogs. Another option is to have the evaluation done in the trigger itself:
This will run a lead through the campaign if they've visited a page at least 20 times in the past month, on their 20th visit. Use whichever minimum number of visits and time period makes sense to your business. You'd also want to set the schedule so the person can only qualify once every X days/weeks/months to prevent Sales from receiving alerts repeatedly in too short of a time frame.
Alternatively, have the Visit Web Page trigger only fire on valuable pages; someone visiting the Unsubscribe page or the Privacy Policy page probably aren't events you want to potentially use to tell Sales to reach out to someone.
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