48"x24"x60 grow tent setup n00b (autofolowering)

Total noob here, lot of experience in the cannabis world but i've never grown before.

I bought autoflowering White Widow from Crop King and started growing it in a Vivosun 48"x24"x60 Grow Tent. Three plants survived. I currently use a shitty 45w i bought here: https://www.amazon.ca/gp/product/B01NAQ1PB2/

1. How many plants can i fit in this grow tent ? It seems like autoflowering plants are smaller than normal plants so i was planning to try to grow 6 plants in 3gal pots

2. How long can i use the 45w light before upgrading ? Also looking for recommendation about which LED light i should buy for my situation... Should i get one very powerful light or two smaller lights ? According to what i've read, i should be fine with a 400w led ? Would this one work? https://www.amazon.ca/Roleadro-Grow-Light-Spectrum-Flowering/dp/B013QLEYTW/

3. What is the ideal time to clone autoflowering plants ?

Thanks !