thank you - it lasts fine for me over a 45 mile ride even in rain, you just have to resist temptation to leave mickling until another day otherwise you may see rust.. FWIW I use Shimano's PTFE lube which has been great - I much prefer it to Finish wet lube which is what I used to use. It's not cheap around £8 for 250ml but lasts and lasts. It is what I used on our 12 month tour getting 14,500km from my chain through all weathers (and some really challeged us - I can not recall having ever had
icicles form on my cycle helmet or waterproof whilst cycling before)