diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/Duration.cpp b/Userland/Libraries/LibJS/Runtime/Temporal/Duration.cpp
index a18c3f8bfe..85ced998cc 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/Duration.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/Duration.cpp
@@ -456,7 +456,7 @@ ThrowCompletionOr<TimeDurationRecord> balance_duration(GlobalObject& global_obje
         days = result.days;
 
         // c. Set nanoseconds to result.[[Nanoseconds]].
-        total_nanoseconds_bigint = result.nanoseconds.cell();
+        total_nanoseconds_bigint = js_bigint(vm, move(result.nanoseconds));
     }
     // 5. Else,
     else {
@@ -1174,7 +1174,7 @@ ThrowCompletionOr<RoundedDuration> round_duration(GlobalObject& global_object, d
         auto result = TRY(nanoseconds_to_days(global_object, *js_bigint(vm, nanoseconds_bigint), intermediate));
 
         // e. Set days to days + result.[[Days]] + result.[[Nanoseconds]] / result.[[DayLength]].
-        auto nanoseconds_division_result = result.nanoseconds->big_integer().divided_by(Crypto::UnsignedBigInteger::create_from((u64)result.day_length));
+        auto nanoseconds_division_result = result.nanoseconds.divided_by(Crypto::UnsignedBigInteger::create_from((u64)result.day_length));
         days += result.days + nanoseconds_division_result.quotient.to_double() + nanoseconds_division_result.remainder.to_double() / result.day_length;
 
         // f. Set hours, minutes, seconds, milliseconds, microseconds, and nanoseconds to 0.
diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/ZonedDateTime.cpp b/Userland/Libraries/LibJS/Runtime/Temporal/ZonedDateTime.cpp
index 980671a6d9..b1777bdc84 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/ZonedDateTime.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/ZonedDateTime.cpp
@@ -444,7 +444,7 @@ ThrowCompletionOr<DurationRecord> difference_zoned_date_time(GlobalObject& globa
     auto result = TRY(nanoseconds_to_days(global_object, *js_bigint(vm, time_remainder_ns), intermediate));
 
     // 13. Let timeDifference be ! BalanceDuration(0, 0, 0, 0, 0, 0, result.[[Nanoseconds]], "hour").
-    auto time_difference = MUST(balance_duration(global_object, 0, 0, 0, 0, 0, 0, result.nanoseconds.cell()->big_integer(), "hour"sv));
+    auto time_difference = MUST(balance_duration(global_object, 0, 0, 0, 0, 0, 0, result.nanoseconds, "hour"sv));
 
     // 14. Return ! CreateDurationRecord(dateDifference.[[Years]], dateDifference.[[Months]], dateDifference.[[Weeks]], result.[[Days]], timeDifference.[[Hours]], timeDifference.[[Minutes]], timeDifference.[[Seconds]], timeDifference.[[Milliseconds]], timeDifference.[[Microseconds]], timeDifference.[[Nanoseconds]]).
     return create_duration_record(date_difference.years, date_difference.months, date_difference.weeks, result.days, time_difference.hours, time_difference.minutes, time_difference.seconds, time_difference.milliseconds, time_difference.microseconds, time_difference.nanoseconds);
@@ -466,7 +466,7 @@ ThrowCompletionOr<NanosecondsToDaysResult> nanoseconds_to_days(GlobalObject& glo
     // 4. If nanoseconds = 0, then
     if (nanoseconds == "0"_bigint) {
         // a. Return the Record { [[Days]]: 0, [[Nanoseconds]]: 0, [[DayLength]]: dayLengthNs }.
-        return NanosecondsToDaysResult { .days = 0, .nanoseconds = make_handle(js_bigint(vm, { 0 })), .day_length = day_length_ns.to_double() };
+        return NanosecondsToDaysResult { .days = 0, .nanoseconds = "0"_sbigint, .day_length = day_length_ns.to_double() };
     }
 
     // 5. If nanoseconds < 0, let sign be −1; else, let sign be 1.
@@ -477,7 +477,7 @@ ThrowCompletionOr<NanosecondsToDaysResult> nanoseconds_to_days(GlobalObject& glo
         // a. Return the Record { [[Days]]: the integral part of nanoseconds / dayLengthNs, [[Nanoseconds]]: (abs(nanoseconds) modulo dayLengthNs) × sign, [[DayLength]]: dayLengthNs }.
         return NanosecondsToDaysResult {
             .days = nanoseconds.divided_by(day_length_ns).quotient.to_double(),
-            .nanoseconds = make_handle(js_bigint(vm, Crypto::SignedBigInteger { nanoseconds.unsigned_value() }.divided_by(day_length_ns).remainder.multiplied_by(Crypto::SignedBigInteger { (i32)sign }))),
+            .nanoseconds = Crypto::SignedBigInteger { nanoseconds.unsigned_value() }.divided_by(day_length_ns).remainder.multiplied_by(Crypto::SignedBigInteger { (i32)sign }),
             .day_length = day_length_ns.to_double()
         };
     }
@@ -554,7 +554,7 @@ ThrowCompletionOr<NanosecondsToDaysResult> nanoseconds_to_days(GlobalObject& glo
     }
 
     // 20. Return the Record { [[Days]]: days, [[Nanoseconds]]: nanoseconds, [[DayLength]]: abs(dayLengthNs) }.
-    return NanosecondsToDaysResult { .days = days, .nanoseconds = make_handle(js_bigint(vm, move(nanoseconds))), .day_length = fabs(day_length_ns.to_double()) };
+    return NanosecondsToDaysResult { .days = days, .nanoseconds = move(nanoseconds), .day_length = fabs(day_length_ns.to_double()) };
 }
 
 }
diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/ZonedDateTime.h b/Userland/Libraries/LibJS/Runtime/Temporal/ZonedDateTime.h
index a40679cebd..fd015295ae 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/ZonedDateTime.h
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/ZonedDateTime.h
@@ -6,7 +6,6 @@
 
 #pragma once
 
-#include <LibJS/Heap/Handle.h>
 #include <LibJS/Runtime/BigInt.h>
 #include <LibJS/Runtime/Object.h>
 
@@ -36,7 +35,7 @@ private:
 
 struct NanosecondsToDaysResult {
     double days;
-    Handle<BigInt> nanoseconds;
+    Crypto::SignedBigInteger nanoseconds;
     double day_length;
 };