A bunch of people here are wrong about a ton of topics:
1st you can pee standing up in the right device. For me the smaller the more comfortable. I've had all sorts, but my favorite is a HT Nub v3. Full sized ones allow partial erection and are extremely painful.
For long term play you will have to build up a thicker skin to prevent chafing. You also need to wear tight underwear that compress and keep everything close.
You will need a lube like vasoline.
Removal for cleaning is a must.
It does get smaller and weaker temporarily.
Longest I've gone to date is several months.
Planning to go a year soon.
I have a deal with the wife, I have to offer oral once a week, and she has to give me five seconds of pleasure once per week. If I give up within the year she gets a tit job. (That she wants)
So she's incentivized to be an exceptionally cruel mistress trying to get me to give up.