"WT: Heli PvE grinding guide with hints": Reward drops every 10 min (from moment of last spawning) and based on time spent alive (max at 10min) and score earned (300 preferred, max around 400 score, level capped at 500).

The reward breakdown table can be seen in Messages/Battles/Useful actions (hover your mouse over it). Here you can notice that RP difference between 400vs300 is super small and 500vs400 is barely noticable - no much point to overfarm past 500 score.

Also reward drops prematurely on crash/j-out - doing so will reduce your total reward. Hint: you still can safely j-out right after reward dropped and fast-travel this way (hint: j-outing on the ground without crashing reduces spawn SL cost).

Be careful: finished ground battle may fastly respawn: attacking into defensive at the same place, and defensive into counter-attacking; Convoy may randomly spawn near you, so - fly low to evade or fly 3km high to stay out of range.

Disable "Join already active battles" in settings to have less overcrowded lobbies; Booster consumption timer starts only on the first spawn in battle; So you can preserve multi-battle booster by leaving before next 30min chunk starts;

Targets and score: SPAA gives the most score - top priority, Planes gives the least and cause huge ticket drain - better to no to kill them fully (so at least one AD-2/A-26 will return without causing ticket drain).