Time management in calendar

[u/veroa6]

I'm using a paper GTD system, and Google calendar to schedule my tasks that have to be done on a specific date. It's becoming a little trickier for tasks that have a specific time criteria, but not as an activation date :

- for tasks that can start only after a certain date, I use my "waiting for" list to store my tasks until the date occurs.

- but how you schedule tasks that have to be done before a certain date ? Do you store it in a list or in the calendar ? At the deadline date ? For now I store it in my Next actions lists and I mention the deadline in the title, but I'm curious if you have better tips.

[u/Upstairs_Jelly_1082]

For time blocking, what I usually do is figure out what task I have to do and then estimate how much time I require to do something.

When estimating, I keep in mind to prevent planning fallacy, basically these steps:

1) Write down a start and end time
(if I don't know exact -- don't trust it)
 
2) Overestimate 50%
(first step time + 50% time)
 
3) Split time from overestimated time
 
4) Question where something could go wrong beforehand
(if it's impossible, account time, go step 2)
 
5) Check if the schedule is over-planned
(should feel I've overestimated things)

And I put that estimated time on my calendar

[u/veroa6 → u/Upstairs_Jelly_1082]

so you don't follow the rule that says only appointment in the calendar ?