Probably not unless you are naturally a heavy user in that hour. There is no disadvantage to popping in but if you only normally use 1kwh, your base load is probably 0.3-0.4kWh. So short of turning your house off at the main switch, you making at most £1. Where as in that short 30 min slot on Saturday, I made about £4, an hour slot will be more like £8 after factoring in recharging the battery.
I made more off exporting my battery for 30 mins on Saturday than I had done in all the other saving sessions where I didn’t have a batter which took place in November, December and January.