That sounds like it should last the week to me. Could be wise to have your boyfriend repot them when you give them to him - my only concern about using multi-use compost is that it likely won’t dry out quick enough and could lead to root rot. Usually it’s good to mix some perlite or other substance into the soil to allow it to dry out faster. In terms of watering, you really just don’t want to let the soil dry out. Don’t keep it soaked, because that will make the roots rot, but also don’t let it dry fully, because then the leaves may start to brown & die off. Hopefully that isn’t too confusing… Good luck!

Putting clay pebbles on the bottoms does nothing bedside creating water retention over them; I also did that for may years but i saw a positive change when I stopped! Regular compost is usually too dense as a substrate try to mix it with some perilte to increase water drainage! Hope this was useful to you!

I recommend Sheffield made plants youtube channel, it is really enlightening!

A Jewel Orchid! I bought one too about a week ago, very pretty! As far as I know it is possible to keep a jewel Orchid as a regular room plant. However, they do need higher humidity, they will grow better in a small terrarium of some sorts. Sphagnum Moss as a substrate also aids in keeping them hydrated. Otherwise I would suggest putting it in a bathroom, where humidity is naturally higher. They also prefer a shadier spot, similar to ferns. I hope this helps :)