Occasionally I find my brain frozen in the dumb zone.
If you have an indicated exposure of 45 seconds and want to account for reciprocity that is stated as:
1 sec: expose 2 secs, (-develop by 10%)
10 secs: expose 1 min (-develop by 20%)
100 secs: expose 20 mins (-develop by 30%)
...would you use the 10 second exposure four and one half times (4-1/2 minutes)?