How long does it take ?

The prisoner I wrote to said it took a month..

I have a penpal in Ohio who I correspond with via Jpay. Those Jpay messages tend to be relatively quick not instant though. I would say the delay is maybe 1 - 3 days depending on the content and length as they still pour over the Jpays before they are released.
It also gives you an option to add a stamp for their reply which can be handy if they are on the lower graded wages.
There is also an option to add photo attachments. I actually find this a pretty easy system to use compared to some platforms.
Although nothing beats the odd snailmail and handwritten words.
Hope you find a penpal that makes this a rewarding experience. Sometimes there are a few bad eggs that make it a daunting experience but it's a highly rewarding friendship.

Depend on jpay if it working or not