Remove magic 7/8 number #12895

Job	Run time
omnibus compilations, trigger	4s
omnibus compilations, #3	5m 6s
omnibus compilations, #5	4m 48s
omnibus compilations, #2	8m 58s
omnibus compilations, #4	4m 17s
omnibus compilations, #6	4m 18s
omnibus compilations, #1	28m 42s
omnibus compilations, #10	4m 20s
omnibus compilations, #8	4m 26s
omnibus compilations, #7	4m 22s
omnibus compilations, #9	4m 38s
omnibus compilations, #12	4m 20s
omnibus compilations, #11	4m 45s
omnibus compilations, result	11s
	1h 23m 15s

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