diff --git a/tools/monitor/get-boxes.R b/tools/monitor/get-boxes.R
index d49a9b8..2277f02 100644
--- a/tools/monitor/get-boxes.R
+++ b/tools/monitor/get-boxes.R
@@ -7,6 +7,10 @@ if (is.null(as.list(environment())$osem_boxes_ts))
 
 b = osem_boxes()
 
+# for $`active` computations
+diffNow = (opensensmapr:::utc_date(Sys.time()) - b$lastMeasurement) %>% as.numeric(unit='hours')
+neverActive = b[is.na(b$lastMeasurement), ] %>% nrow()
+
 # only keep aggregated data
 b_agg = data.frame(time = Sys.time(), boxcount = nrow(b))
 b_agg$model = b$model %>% table() %>% as.list() %>% list()
@@ -14,6 +18,14 @@ b_agg$exposure = b$exposure %>% table() %>% as.list() %>% list()
 b_agg$geometry = b %>% osem_as_sf() %>% st_geometry() %>% list()
 b_agg$phenomena = b %>% osem_phenomena() %>% list()
 
+b_agg$active = list(
+  'never' = neverActive,
+  '1h' = nrow(b[diffNow <= 1, ]) - neverActive,
+  '1d' = nrow(b[diffNow <= 24, ]) - neverActive,
+  '30d' = nrow(b[diffNow <= 720, ]) - neverActive,
+  '365d' = nrow(b[diffNow <= 8760, ]) - neverActive
+) %>% list()
+
 # combine with existing time series
 osem_boxes_ts = rbind(b_agg, osem_boxes_ts)