I didn't think it would be any different for Artificers and Wizards. I knew that it gives the number days as a result of time and each day = 8 hours.
I only really thought of it because I've played RPGs where making magic items/spells took days to weeks to months and you were given the total amount of time it would take - split into days of 8 hours each. Then from there you can work 2 hours a day or 16 hours a day (there was a min/max per day to be effective).
Game mechanics are seperated into two departments: Logic & Balance.
Logically, unless you're doing something time sensitive, you can walk away and pick it up later. I could walk away from this post and finish it a day or three later - it's not time sensitive. Since you can walk away from making an item between days, in 8 hour blocks of time, it doesn't strike me that making an item is time sensitive. You can spend 3 days, then walk away for 5 weeks and go back and continue. I'd find it strange that each day is time sensitive within it's own frame and the overall time isn't.
Thats why logically I assume there isn't a reason why there was a difference between walking away for the day after 4 hours and 8 hours.
Balance is another issue and sometimes defies logic just to make play fair and fun for everyone.
But, I can't see how letting someone be flexible with their time (working longer/shorter days) would be a balance issue unless it's supposed to be a punishment designed to take your character out of the game for a time - which I don't see it as.
It seems that the people who wrote the game might have had more... modular games than others who play it. ie, one adventure is down and players have time off to do what they wish and have fun, then at another point another (maybe continuing) adventure picks up.
Unfortunatly my GM has a continious game set up. The group is lucky to get 8 hours to sleep, let alone 8 hours to make a days deposit of work.
Oh well, I'll give it another level and if my artificer still can't make anything I'll just switch over to Wizard or Sorcerer. I should be able to make use of my Infusions & making items as well as actually having a class ability I can use effectively in the game
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