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db.collection.aggregate([{$setWindowFields:{partitionBy:{$concat:["$ip","$date"]},sortBy:{"time.time":1},output:{prevtime:{$push:"$time.time",window:{documents:[-1,"current"]}}}}},{$addFields:{minutesDiff:{$toInt:{$dateDiff:{startDate:{$first:"$prevtime"},endDate:{$last:"$prevtime"},unit:"minute"}}}}},{$addFields:{deltaIndex:{$cond:[{$gt:["$minutesDiff",120]},1,0]}}},{$setWindowFields:{partitionBy:{$concat:["$ip","$date"]},sortBy:{"time.time":1},output:{groupIndex:{$sum:"$deltaIndex",window:{documents:["unbounded","current"]}},duration:{$push:"$minutesDiff",window:{documents:["current",1]}}}}},{$set:{duration:{$cond:[{$and:[{$eq:[{$size:"$duration"},2]},{$lte:[{$last:"$duration"},120]}]},{$last:"$duration"},2]}}},{$group:{_id:{ip:"$ip",myDate:"$date",groupIndex:"$groupIndex"},"date":{$first:"$date"},"allVisitedPages":{$push:{page:"$page",time:"$time",duration:"$duration"}},visitedPages:{$sum:1}}},{$unset:"_id.groupIndex"}])