They will optimise for probability of a search leading to purchases and likely see 5s searches leading to fewer purchases than 90s searches. You get the same p

They will optimise for probability of a search leading to purchases and likely see 5s searches leading to fewer purchases than 90s searches. You get the same phenomena in retail. You get intentionally confusing layouts in shops, hidden exits, difficult placement of essentials and related items spread at different ends of the store, no clocks etc. to maximise the amount of time a customer spends in their store. It works.