Variable time support in create_objective_function. #228

Job	Run time
Build and run tests (ubuntu-latest, 3.8)	3m 27s
Build and run tests (ubuntu-latest, 3.9)	3m 12s
Build and run tests (ubuntu-latest, 3.10)	3m 27s
Build and run tests (ubuntu-latest, 3.11)	3m 48s
Build and run tests (ubuntu-latest, 3.12)	3m 49s
Build and run tests (macos-13, 3.8)	5m 0s
Build and run tests (macos-13, 3.9)	5m 18s
Build and run tests (macos-13, 3.10)	4m 54s
Build and run tests (macos-13, 3.11)	4m 48s
Build and run tests (macos-13, 3.12)	6m 47s
Build and run tests (macos-latest, 3.8)	2m 53s
Build and run tests (macos-latest, 3.9)	2m 21s
Build and run tests (macos-latest, 3.10)	2m 24s
Build and run tests (macos-latest, 3.11)	2m 25s
Build and run tests (macos-latest, 3.12)	2m 45s
Build and run tests (windows-latest, 3.8)	6m 29s
Build and run tests (windows-latest, 3.9)	6m 4s
Build and run tests (windows-latest, 3.10)	6m 17s
Build and run tests (windows-latest, 3.11)	6m 20s
Build and run tests (windows-latest, 3.12)	6m 36s
	1h 29m 4s

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