diff --git a/R/validation.R b/R/validation.R
index ad898e20..e268dac4 100644
--- a/R/validation.R
+++ b/R/validation.R
@@ -203,6 +203,51 @@ validate_surv_truth_list_estimate <- function(truth,
       call = call
     )
   }
+
+  all_eval_times_list <- lapply(estimate, function(x) x$.eval_time)
+  all_eval_times <- unlist(all_eval_times_list)
+
+  if (any(is.na(all_eval_times))) {
+    cli::cli_abort(
+      c(
+        x = "Missing values in {.field .eval_time} are not allowed."
+      ),
+      call = call
+    )
+  }
+
+  if (any(all_eval_times < 0)) {
+    offenders <- unique(all_eval_times[all_eval_times < 0])
+
+    cli::cli_abort(
+      c(
+        x = "Negative values of {.field .eval_time} are not allowed.",
+        i = "The following negative values were found: {.val {offenders}}."
+      ),
+      call = call
+    )
+  }
+
+  if (any(is.infinite(all_eval_times))) {
+    cli::cli_abort(
+      c(
+        x = "Infinite values of {.field .eval_time} are not allowed."
+      ),
+      call = call
+    )
+  }
+
+  any_duplicates <- any(
+    vapply(all_eval_times_list, function(x) any(table(x) > 1), logical(1))
+  )
+  if (any_duplicates) {
+    cli::cli_abort(
+      c(
+        x = "Duplicate values of {.field .eval_time} are not allowed."
+      ),
+      call = call
+    )
+  }
 }
 
 validate_surv_truth_numeric_estimate <- function(truth,
diff --git a/tests/testthat/_snaps/validation.md b/tests/testthat/_snaps/validation.md
index 9cc0bb3a..d81cdf04 100644
--- a/tests/testthat/_snaps/validation.md
+++ b/tests/testthat/_snaps/validation.md
@@ -249,6 +249,40 @@
       Error:
       ! `estimate` should be a list, not a a double vector.
 
+---
+
+    Code
+      validate_surv_truth_list_estimate(lung_surv_neg$surv_obj, lung_surv_neg$.pred)
+    Condition
+      Error:
+      x Negative values of .eval_time are not allowed.
+      i The following negative values were found: -100.
+
+---
+
+    Code
+      validate_surv_truth_list_estimate(lung_surv_na$surv_obj, lung_surv_na$.pred)
+    Condition
+      Error:
+      x Missing values in .eval_time are not allowed.
+
+---
+
+    Code
+      validate_surv_truth_list_estimate(lung_surv_inf$surv_obj, lung_surv_inf$.pred)
+    Condition
+      Error:
+      x Infinite values of .eval_time are not allowed.
+
+---
+
+    Code
+      validate_surv_truth_list_estimate(lung_surv_duplicate$surv_obj,
+      lung_surv_duplicate$.pred)
+    Condition
+      Error:
+      x Duplicate values of .eval_time are not allowed.
+
 # validate_case_weights errors as expected
 
     Code
diff --git a/tests/testthat/test-validation.R b/tests/testthat/test-validation.R
index 0b373148..b4327b60 100644
--- a/tests/testthat/test-validation.R
+++ b/tests/testthat/test-validation.R
@@ -387,6 +387,46 @@ test_that("validate_surv_truth_list_estimate errors as expected", {
       lung_surv$.pred_time
     )
   )
+
+  lung_surv_neg <- lung_surv
+  lung_surv_neg$.pred[[1]]$.eval_time[1] <- -100
+  expect_snapshot(
+    error = TRUE,
+    validate_surv_truth_list_estimate(
+      lung_surv_neg$surv_obj,
+      lung_surv_neg$.pred
+    )
+  )
+
+  lung_surv_na <- lung_surv
+  lung_surv_na$.pred[[1]]$.eval_time[1] <- NA
+  expect_snapshot(
+    error = TRUE,
+    validate_surv_truth_list_estimate(
+      lung_surv_na$surv_obj,
+      lung_surv_na$.pred
+    )
+  )
+
+  lung_surv_inf <- lung_surv
+  lung_surv_inf$.pred[[1]]$.eval_time[1] <- Inf
+  expect_snapshot(
+    error = TRUE,
+    validate_surv_truth_list_estimate(
+      lung_surv_inf$surv_obj,
+      lung_surv_inf$.pred
+    )
+  )
+
+  lung_surv_duplicate <- lung_surv
+  lung_surv_duplicate$.pred[[1]]$.eval_time[1] <- 200
+  expect_snapshot(
+    error = TRUE,
+    validate_surv_truth_list_estimate(
+      lung_surv_duplicate$surv_obj,
+      lung_surv_duplicate$.pred
+    )
+  )
 })
 
 test_that("validate_case_weights errors as expected", {