stardew-valley
I noticed that fruit trees don't need to be harvested everyday when they've matured. If you wait 2 days, then the tree will have 2 fruit instead of 1.
So how long does it take for a fruit tree to fill up with the maximum amount of fruit that it can hold?
You need to place the Tapper on the tree, and it needs to be on a fully grown tree (aka no stumps).
Prices and production time will vary based on the tree you attached it to, but it can take up to 8 days. I've included screenshots below showing the prices and production time of the different products (source), as well as an image showing the three different trees you can tap.
It takes two days to upgrade the watering can. Since you can use the watering can both on the day you take it into the shop and the day you pick it up, there's normally only one day that you won't be able to water your plants. So you want to ensure you don't need to water your plants that day. There are a few easy ways to ensure this without having to resort installing a bunch of sprinklers.
Finally you should also ensure that you'll be able to pick up the watering can on day the it will be available. Clint's store is closed or otherwise inaccessible on most festival days.
I should also I point out I discovered the last problem the hard way. As it turns it out not watering your crops one day isn't the end of the world. None of them died, it just delayed their growth by one day.
Best Answer
After some testing, I found that fruit trees can hold a maximum of 3 fruit, so it takes 3 days for a tree to reach its max limit before it needs to be harvested.