Measure load test time more accurately

.github/scripts/flamegraph_watcher.sh

@@ -4,16 +4,19 @@
 # then polls the account balance until the expected balance has been reached
 # and then kills the process. It also measures the elapsed time of the test and
 # outputs it to Github Action's outputs.
-SECONDS=0
-
 iterations=1000
-value=10000000
+value=1
 account=0x33c6b73432B3aeA0C1725E415CC40D04908B85fd
 end_val=$((172 * $iterations * $value))
 
 ethrex_l2 test load --path /home/runner/work/ethrex/ethrex/test_data/private_keys.txt -i $iterations -v  --value $value --to $account
 
 output=$(cast balance $account --rpc-url=http://localhost:1729 2>&1)
+while [[ $output -eq 0 ]]; do
+    sleep 5
+    output=$(cast balance $account --rpc-url=http://localhost:1729 2>&1)
+done
+SECONDS=0 # Server is online since balance started, so start measuring time
 while [[ $output -le $end_val ]]; do
     sleep 5
     output=$(cast balance $account --rpc-url=http://localhost:1729 2>&1)